Number of shares converted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued Upon Conversion Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued Upon Conversion Accrued expenses and other current liabilities Accrued Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Exercise period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Disclosure of non-cash transfers to (from) Parent: Disclosure Of Non-Cash Transfers To (From) Parent: [Abstract] Disclosure Of Non-Cash Transfers To (From) Parent: Award Type [Domain] Award Type [Domain] Remaining performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Non-vested, beginning balance (in shares) Non-vested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Effective interest rate Line of Credit Facility, Interest Rate at Period End DEBT Debt Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Number of countries in which entity operates (more than) Number of Countries in which Entity Operates Revolving credit facility Revolving Credit Facility [Member] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Performance Shares Performance Shares [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Accounts payable Accounts Payable, Current Exercisable, weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Tax effect of adjustments Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Commitments and contingent liabilities (Note 8) Commitments and Contingencies Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Cliff vesting period Share Based Compensation Arrangement By Share Based Payment Award, Cliff Vesting Period Share Based Compensation Arrangement By Share Based Payment Award, Cliff Vesting Period PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY Equity [Text Block] Liability Derivative Liability, Not Subject to Master Netting Arrangement Schedule of Goodwill [Table] Schedule of Goodwill [Table] Geographical [Axis] Geographical [Axis] INCOME TAXES Income Tax Disclosure [Text Block] Decrease in unearned revenue Increase (Decrease) in Contract with Customer, Liability Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Concentration Risk [Line Items] Concentration Risk [Line Items] Customer [Axis] Customer [Axis] Current liabilities: Liabilities, Current [Abstract] Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Intersegment eliminations Intersegment Eliminations [Member] Debt issuance discount and fees Debt Issuance Costs, Noncurrent, Net ARPP, maximum facility amount Accounts Receivable Purchase Program, Maximum Facility Amount Accounts Receivable Purchase Program, Maximum Facility Amount Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Diluted (in dollars per share) Per share amount, diluted (in dollars per share) Earnings Per Share, Diluted Reclassification of Former Parent investment to additional paid-in capital Adjustments To Additional Paid In Capital, Former Parent Investment Reclassification Adjustments To Additional Paid In Capital, Former Parent Investment Reclassification Goodwill [Roll Forward] Goodwill [Roll Forward] Supplemental Cash Flow Elements [Abstract] Line of credit Line of Credit [Member] Outstanding, beginning (in shares) Outstanding, ending (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Trading Symbol Trading Symbol Letters of credit outstanding Letters of Credit Outstanding, Amount Granted (in dollar per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-average grant date fair value per option (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Net income (loss) Net income (loss) Net earnings (loss) Net Income (Loss) Total current liabilities Liabilities, Current Derivative Contract [Domain] Derivative Contract [Domain] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Unrealized gain on derivative instruments Unrealized gain on derivative instrument Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax, Parent Other Other Intangible Assets [Member] Reconciliation of Basic Earnings per Share to Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Corporate and other allocations Direct costs Related Party Transaction, Amounts of Transaction Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Proceeds from sale of assets Proceeds from Sale of Productive Assets Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Converted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period Exercised (in dollar per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Goodwill, net Balance as of December 31 Balance as of September 30 Goodwill Equity Components [Axis] Equity Components [Axis] Decrease in accrued expenses and other Increase (Decrease) in Accrued Liabilities Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Entity Small Business Entity Small Business Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Estimated amortization expense, 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four Local Phone Number Local Phone Number Letter of credit Letter of Credit [Member] Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] Derivative, notional amount Derivative, Notional Amount Accounts receivable and unbilled services Accounts Receivable [Member] One customer One Customer [Member] One Customer Operating lease liabilities Operating Lease, Liability, Noncurrent BASIS OF FINANCIAL STATEMENT PREPARATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Debt term Debt Instrument, Term Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Former parent investment Net Parent Investment Net Parent Investment Debt issuance costs Payments of Debt Issuance Costs Restructuring and other charges Restructuring, Settlement and Impairment Provisions Income Statement Location [Axis] Income Statement Location [Axis] Schedule of Debt Schedule of Long-Term Debt Instruments [Table Text Block] Foreign currency forward contracts Foreign Exchange Forward [Member] Europe Europe [Member] One pharmaceutical company One Pharmaceutical Company [Member] One Pharmaceutical Company Schedule of Antidilutive Securities Excluded from Computation Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Beginning balance Ending balance Restructuring Reserve Enabling Services Enabling Services Segment [Member] Enabling Services Segment Change in accrued property, plant and equipment Noncash Investing and Financing Activities, Change In Accrued Property, Plant And Equipment Noncash Investing and Financing Activities, Change In Accrued Property, Plant And Equipment Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award Type [Axis] Award Type [Axis] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Granted (in share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Sales commission assets Sales Commission Assets [Member] Sales Commission Assets Plan Name [Domain] Plan Name [Domain] Document Quarterly Report Document Quarterly Report Disclosure of non-cash investing activities: Noncash Investing and Financing Items [Abstract] Interest expense Interest Expense Number of shares authorized for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Hedging Designation [Axis] Hedging Designation [Axis] Goodwill [Line Items] Goodwill [Line Items] Outstanding, weighted average remaining contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Estimated amortization expense, remainder of year Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] TRANSACTIONS WITH FORMER PARENT Related Party Transactions Disclosure [Text Block] Performance obligation partially satisfied in previous period, revenue recognized Contract with Customer, Performance Obligation Satisfied in Previous Period Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Asset Derivative Asset, Not Subject to Master Netting Arrangement Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Foreign currency translation adjustments Current quarter foreign exchange adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Short-term operating lease liabilities Operating Lease, Liability, Current Annual agency fee Line of Credit Facility, Annual Agency Fee Line of Credit Facility, Agency Fee Amortization of intangible assets Amortization of Intangible Assets Entity Shell Company Entity Shell Company Net Carrying Amount Finite-Lived Intangible Assets, Net Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period General financing activities General Financing Activities [Member] General Financing Activities Commitment fee Line of Credit Facility, Commitment Fee Percentage Unearned revenue Contract with Customer, Liability, Current Schedule of Fair Value Estimates Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Security Exchange Name Security Exchange Name Selling, general and administrative expenses, exclusive of depreciation and amortization Selling, General and Administrative Expense Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Award vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Employee stock options and awards Stock Options Employee Stock Option [Member] DERIVATIVE INSTRUMENTS AND HEDGING Derivative Instruments and Hedging Activities Disclosure [Text Block] Unrecognized compensation cost, recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Senior secured revolving credit facility Senior Secured Revolving Credit Facility [Member] Senior Secured Revolving Credit Facility Total costs and expenses Costs and Expenses Maximum Maximum [Member] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule Of Restructuring and Other Charges Restructuring and Related Costs [Table Text Block] Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Type Document Type Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Goodwill acquired during the period Goodwill, Acquired During Period Entity Address, Address Line One Entity Address, Address Line One Direct costs, exclusive of depreciation and amortization (including costs incurred from related parties of $0.0, $21.6, $48.8 and $65.7 during the three and nine months ended September 30, 2023 and 2022, respectively) Costs incurred from related parties Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] STOCK COMPENSATION PLANS Share-Based Payment Arrangement [Text Block] Total contract assets Capitalized Contract Cost, Net Basis of Financial Statement Presentation Basis of Accounting, Policy [Policy Text Block] Other, net Other Noncash Income (Expense) Weighted-Average Exercise Price per Option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Net transfers (to) from Former Parent Net Transfers From (To) Parent, Excluding Special Payment. Net Transfers From (To) Parent, Excluding Special Payment. Remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Less: Allowance for credit losses Allowance for credit losses as of December, 2022 Allowance for credit losses as of September 30, 2023 Accounts Receivable, Allowance for Credit Loss, Current Customer concentration risk Customer Concentration Risk [Member] Components of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Clinical Services Clinical Services Segment [Member] Clinical Services Segment Income Statement [Abstract] Income Statement [Abstract] Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Costs and expenses: Costs and Expenses [Abstract] Title of 12(b) Security Title of 12(b) Security Restructuring and Other Charges [Line Items] Restructuring Cost and Reserve [Line Items] Related Party, Type [Domain] Related Party, Type [Domain] Operating segments Operating Segments [Member] Non-vested, beginning balance (in dollars per share) Non-vested, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Derivative, fixed interest rate Derivative, Fixed Interest Rate Schedule of Accounts Receivable, Unbilled Services and Unearned Revenue Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Entity Tax Identification Number Entity Tax Identification Number Foreign currency impact Goodwill, Foreign Currency Translation Gain (Loss) Special payment to Former Parent Special Payment To Former Parent Special Payment To Former Parent Capitalized assets, amortization Capitalized Contract Cost, Amortization Change in right-of-use lease assets Transfer To (From) Parent, Change In Right-Of-Use Lease Asset Transfer To (From) Parent, Change In Right-Of-Use Lease Asset Other Other Geographical Areas [Member] Other Geographical Areas Statistical Measurement [Axis] Statistical Measurement [Axis] Direct costs Direct Costs, Related Party [Member] Direct Costs, Related Party Entity Interactive Data Current Entity Interactive Data Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Deferred income taxes and other tax liabilities Deferred Income Taxes and Other Tax Liabilities, Noncurrent Summary of Capitalized Contract Cost Capitalized Contract Cost [Table Text Block] Segments [Domain] Segments [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidation Items [Domain] Consolidation Items [Domain] Accumulated deficit Retained Earnings (Accumulated Deficit) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Aggregate principal amount issued Debt Instrument, Face Amount Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Current assets: Assets, Current [Abstract] Accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Entity Address, State or Province Entity Address, State or Province CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Debt issuance discount and fees Debt Issuance Costs, Current, Net Estimated amortization expense, 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Corporate costs not allocated to segments Other Cost and Expense, Operating Increase in accounts receivable and unbilled services, net Increase (Decrease) In Accounts Receivable And Contract With Customer, Asset Increase (Decrease) In Accounts Receivable And Contract With Customer, Asset Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Customer [Domain] Customer [Domain] Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Interest rate swaps Interest Rate Swap [Member] Debt Instrument [Axis] Debt Instrument [Axis] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Net benefit plan adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Converted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period, Weighted Average Grant Date Fair Value Credit Facility [Axis] Credit Facility [Axis] Total liabilities Liabilities Vesting [Domain] Vesting [Domain] Increase in prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Payments on revolving credit facilities Repayments of Long-Term Lines of Credit Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Net Benefit Plan Adjustments Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Plan Name [Axis] Plan Name [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] North America North America [Member] Related Party Transaction [Domain] Related Party Transaction [Domain] Income tax benefits Share-Based Payment Arrangement, Expense, Tax Benefit Number of reportable segments Number of Reportable Segments Earnings (loss) per common share Earnings Per Share [Abstract] Proceeds from issuance of senior notes Proceeds from Issuance of Senior Long-Term Debt Decrease in unrecognized tax benefits, reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible Common stock, 88.8 and 0.0 shares outstanding at September 30, 2023 and December 31, 2022, respectively Common Stock, Value, Issued Former Parent Investment Parent Company Investment [Member] Parent Company Investment Provision (benefit) for income tax related to items of comprehensive income Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Organization, Consolidation and Presentation of Financial Statements [Abstract] Operating lease right-of-use asset expense Operating Lease, Right-of-Use Asset, Periodic Reduction Senior notes Senior Notes [Member] Total current assets Assets, Current Current portion of debt, gross Long-Term Debt, Gross, Current Maturities Long-Term Debt, Gross, Current Maturities Special payment to Former Parent Net Transfers To Parent, Special Payment Net Transfers To Parent, Special Payment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Supplemental schedule of cash flow information: Supplemental Cash Flow Information [Abstract] Amortization Amortization Other, net Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Proceeds from term loans Proceeds from Issuance of Secured Debt Restructuring Reserve, by Type of Restructuring [Axis] Restructuring Type [Axis] Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Concentration risk, percentage Concentration Risk, Percentage Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Cancelled (in share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Current Portion of Long-Term Debt Short-Term Debt [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Exercisable, aggregate intrinsic value (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Change in property, plant and equipment, net Transfer To (From) Parent, Change In Property, Plant And Equipment, Net Transfer To (From) Parent, Change In Property, Plant And Equipment, Net Corporate, non-segment Corporate, Non-Segment [Member] Depreciation and amortization Depreciation, Depletion and Amortization Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Senior secured term loan B due 2030 Senior Secured Term Loan B Facility, Due 2028 [Member] Senior Secured Term Loan B Facility, Due 2028 Total equity Beginning balance Ending balance Equity, Attributable to Parent Consolidation Items [Axis] Consolidation Items [Axis] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Number of employees (more than) Entity Number of Employees Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Unearned revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Unrealized Gain (Loss) on Derivative Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Weighted-average expected life (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Net income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Senior secured term loan A due 2028 Senior Secured Term Loan A Facility, Due 2028 [Member] Senior Secured Term Loan A Facility, Due 2028 RESTRUCTURING AND OTHER CHARGES Restructuring and Related Activities Disclosure [Text Block] Hedging Designation [Domain] Hedging Designation [Domain] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Capital expenditures Payments to Acquire Productive Assets Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Unrecognized tax benefits, decrease Unrecognized Tax Benefits, Period Increase (Decrease) Document Fiscal Period Focus Document Fiscal Period Focus Antidilutive Securities [Axis] Antidilutive Securities [Axis] Options, beginning (in dollar per share) Options, ending (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Stock compensation Share-Based Payment Arrangement, Noncash Expense Common Stock Common Stock [Member] Special Payment to Former Parent Special Payment To Former Parent [Member] Special Payment To Former Parent City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code EARNINGS (LOSS) PER SHARE Earnings Per Share [Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Schedule of Restricted Stock Units and Performance Shares Schedule of Nonvested Share Activity [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Stock compensation expense Stock Compensation Expense [Member] Stock Compensation Expense Foreign exchange gain (loss) Foreign Exchange Gain (Loss), Related Party [Member] Foreign Exchange Gain (Loss), Related Party Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Minimum Minimum [Member] Property, plant and equipment, net Property, Plant and Equipment, Net Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] ASSETS Assets [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Cash paid during period for: Interest And Income Taxes Paid [Abstract] Interest And Income Taxes Paid Foreign exchange gain (loss) Gain (Loss), Foreign Currency Transaction, before Tax Income taxes, net of refunds Income Taxes Paid, Net Restructuring and other charges Restructuring And Other Charges, Related Party [Member] Restructuring And Other Charges, Related Party Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Deferred income taxes Deferred Income Tax Assets, Net COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Gross unbilled services Contract with Customer, Asset, before Allowance for Credit Loss, Current Accumulated Deficit Retained Earnings [Member] Current portion of long-term debt Total short-term borrowings and current portion of long-term debt Long-Term Debt, Current Maturities Schedule of Share-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total liabilities and equity Liabilities and Equity Other income (expense): Nonoperating Income (Expense) [Abstract] Other assets, net Other Assets, Noncurrent Risk free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Basic (in dollars per share) Per share amount, basic (in dollars per share) Earnings Per Share, Basic Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Long-Term Debt Long-Term Debt and Lease Obligation [Abstract] Net earnings (loss) including impact of dilutive adjustments Net Income (Loss) Available to Common Stockholders, Diluted Entity Address, City or Town Entity Address, City or Town Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Related party Related Party [Member] Corporate allocations Corporate Allocations [Member] Corporate Allocations Fortrea’s Omnibus Incentive Plan Fortrea’s Omnibus Incentive Plan [Member] Fortrea’s Omnibus Incentive Plan Expense Restructuring and other Restructuring Charges Document Transition Report Document Transition Report Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Technology Technology-Based Intangible Assets [Member] Deferred contract costs Deferred Contract Costs [Member] Deferred Contract Costs Common stock, shares authorized (in shares) Common Stock, Shares Authorized Increase in accounts payable Increase (Decrease) in Accounts Payable Accounts receivable and unbilled services, net Total Accounts Receivable And Contract With Customer, Asset, After Allowance for Credit Loss, Current Accounts Receivable And Contract With Customer, Asset, After Allowance for Credit Loss, Current Derivative Instrument [Axis] Derivative Instrument [Axis] Adjustments to reconcile net income to net cash provided by (used for) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Swingline sub-facility Bridge Loan [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Debt, gross Long-Term Debt, Gross, Excluding Current Maturities Long-Term Debt, Gross, Excluding Current Maturities Credit loss expense Accounts Receivable, Credit Loss Expense (Reversal) Additional paid-in capital Additional Paid in Capital Cancelled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Deferred income taxes Deferred Income Tax Expense (Benefit) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Year three Share-Based Payment Arrangement, Tranche Three [Member] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Prepaid expenses and other Prepaid Expense and Other Assets, Current Estimated amortization expense, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Cancelled (in share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Related Party, Type [Axis] Related Party, Type [Axis] Outstanding, aggregate intrinsic value (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Entity Registrant Name Entity Registrant Name Dilutive effect of employee awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Estimated amortization expense, 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Year two Share-Based Payment Arrangement, Tranche Two [Member] Direct costs Cost of Sales [Member] Severance and Other Employee Costs Employee Severance [Member] Cash payments Payments for Restructuring Document Period End Date Document Period End Date Exercisable (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Principal payments of long-term debt Repayments of Long-Term Debt Rollforward of Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] Entity Central Index Key Entity Central Index Key Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total stock compensation expense Share-Based Payment Arrangement, Expense Gross Carrying Amount Finite-Lived Intangible Assets, Gross Provision for (benefit from) income taxes Income Tax Expense (Benefit) Designated as hedging instrument Designated as Hedging Instrument [Member] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Vesting [Axis] Vesting [Axis] Estimated amortization expense, thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Number of operating segments Number of Operating Segments Revenue Revenue Benchmark [Member] Subcontract services Subcontract Services [Member] Subcontract Services Other comprehensive loss, net of tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Summary of Revenue by Segment and Geography Disaggregation of Revenue [Table Text Block] 7.5% senior notes due 2030 7.5% Senior Notes, Due 2030 [Member] 7.5% Senior Notes, Due 2030 Issuance of common stock Stock Issued During Period, Value, New Issues Equity [Abstract] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Number of countries with primary office locations Number Of Countries With Primary Office Locations Number Of Countries With Primary Office Locations Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Credit Facility [Domain] Credit Facility [Domain] Total net transfers (to) from Former Parent Net Transfers From (To) Parent Net Transfers From (To) Parent Long-term debt, less current portion Total long-term debt Long-Term Debt, Excluding Current Maturities Number of derivative instruments Derivative, Number of Instruments Held Outstanding shares, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Employee Stock Purchase Plan Fortrea's Employee Stock Purchase Plan [Member] Fortrea's Employee Stock Purchase Plan REVENUES Revenue from Contract with Customer [Text Block] Additional Paid-in Capital Additional Paid-in Capital [Member] Cancelled (in dollar per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Total assets Assets Cover [Abstract] Cover [Abstract] Stock compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Other liabilities Other Liabilities, Noncurrent Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Other comprehensive loss before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent BUSINESS SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Secured debt Secured Debt [Member] Proceeds from sale of receivables Proceeds from Sale of Other Receivables Equity Component [Domain] Equity Component [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Outstanding shares, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Accounts receivable sold Accounts Receivable, Sale Operating income Segment operating income: Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Related Party Transaction [Axis] Related Party Transaction [Axis] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Concentration Risk [Table] Concentration Risk [Table] Transfer from Former Parent Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Stock Options Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Selling, general and administrative expenses Selling, General And Administrative Expenses, Related Party [Member] Selling, General And Administrative Expenses, Related Party Line of credit, outstanding balance Long-Term Line of Credit Customer relationships Customer Relationships [Member] Facility Costs Facility Cost [Member] Facility Cost Proceeds from revolving credit facilities Proceeds from Long-Term Lines of Credit Net transfers to Former Parent Proceeds From (Payments To) Former Parent Company Proceeds From (Payments To) Former Parent Company Type of Restructuring [Domain] Type of Restructuring [Domain] Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year one Share-Based Payment Arrangement, Tranche One [Member]