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Benefit Plan, Plan Assets, Target Allocation, Percentage Recently Issued and Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Proceeds from sale of business, net Proceeds from Divestiture of Businesses, Net of Cash Divested Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] TRANSACTIONS WITH FORMER PARENT Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] REVENUES Revenue from Contract with Customer [Text Block] 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 Withholding tax Effective Income Tax Rate Reconciliation, Withholding Tax, Percent Effective Income Tax Rate 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[Domain] Grantee Status [Domain] Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total equity Beginning balance Ending balance Equity, Attributable to Parent Class of warrant or right, security called by each warrant or right, value, multiple Class Of Warrant Or Right, Security Called By Each Warrant Or Right, Value, Multiple Class Of Warrant Or Right, Security Called By Each Warrant Or Right, Value, Multiple Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Effective interest rate Line of Credit Facility, Interest Rate at Period End Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Accrued pass through expenses Accrued Pass Through Expenses Accrued Pass Through Expenses LIABILITIES AND EQUITY Liabilities and Equity [Abstract] State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Restructuring and other charges Total Restructuring and Related Cost, Incurred Cost Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Exercisable (in dollar per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Swingline sub-facility Bridge Loan [Member] Net Carrying Amount Finite-Lived Intangible Assets, Net Capitalized Software Costs and Cloud Computing Arrangements Internal Use Software, Policy [Policy Text Block] Non-PEO NEO 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and other charges Disposal Group, Including Discontinued Operation, Restructuring And Other Charges Disposal Group, Including Discontinued Operation, Restructuring And Other Charges Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Schedule of Share-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Short-term operating lease liabilities Short-term operating lease liabilities Less current portion Operating Lease, Liability, Current Software Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Inducement Plan Inducement Plan [Member] Inducement Plan Award Timing Method Award Timing Method [Text Block] Basic earnings (loss) per share from continued operations (in dollars 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Prepaid expenses and other Prepaid expenses and other Prepaid Expense and Other Assets, Current Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Basic earnings (loss) per share from discontinued operations (in dollars per share) Per share amount, basic (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Other, net Disposal Group, Including Discontinued Operation, Other Income (Expense) Disposal Group, Including Discontinued Operation, Other Income (Expense) Document Information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments 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Plan [Table] Defined Benefit Plan [Table] Unrealized foreign exchange movements Unrealized Gain (Loss), Foreign Currency Transaction, after Tax Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Year one Share-Based Payment Arrangement, Tranche One [Member] Unearned revenue Contract with Customer, Liability, Current Class of warrant or right, exercise price of warrants or rights (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Decrease (increase) in prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Defined Benefit Plan, Plan Assets, Allocation [Line Items] Defined Benefit Plan, Plan Assets, Allocation [Line Items] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Benefits and administrative expenses paid Defined Benefit Plan, Benefit Obligation, Benefits Paid 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[Member] Foreign exchange gain (loss) Foreign Currency Gain (Loss) [Member] Award Type [Domain] Award Type [Domain] Pre-Tax Gain (Loss) Included in Other Comprehensive Income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Other, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Canada CANADA Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Compensation Amount Outstanding Recovery Compensation Amount Deferred: Deferred 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Complete Contract Change in Scope And Change In Estimated Effort To Complete Contract [Member] Change in Scope And Change In Estimated Effort To Complete Contract Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] DEBT Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Operating cash flows from operating leases Operating Lease, Payments Contract cost, amortization period Capitalized Contract Cost, Amortization Period Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Defined Contribution Plan, Variable Component [Axis] Defined Contribution Plan, Variable Component [Axis] Defined Contribution Plan, Variable Component Discontinued Operations Discontinued Operations [Member] 2025 Restructuring Plan 2025 Restructuring Plan [Member] 2025 Restructuring Plan Foreign Current Foreign Tax Expense 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Of One-Percentage-Point Increase In Expected Return On Plan Assets Special Payment to Former Parent Special Payment To Former Parent [Member] Special Payment To Former Parent Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Uncertain tax positions, interest and penalties expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Corporate costs not included in segment operating income Other Cost and Expense, Operating Schedule of Changes in Projected Benefit Obligations Schedule of Changes in Projected Benefit Obligations [Table Text Block] Foreign earnings Deferred Tax Liabilities, Undistributed Foreign Earnings Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding State Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of 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Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Spain SPAIN Revenues Revenue reduction Revenue from Contract with Customer, Excluding Assessed Tax Effect of Change in Accounting Estimate, Type [Domain] Effect of Change in Accounting Estimate, Type [Domain] Reduction of prior restructuring accruals Restructuring Reserve, Accrual Adjustment Total current assets Assets, Current Impairment of facility related assets Restructuring Impairment Charges Restructuring Impairment Charges Statistical Measurement [Axis] Statistical Measurement [Axis] Loss contingency accrual Loss Contingency Accrual Derivative, fixed interest rate Derivative, Fixed Interest Rate Accrued expenses and other Accrued Liabilities [Member] Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Payments for taxes related to net share settlement of stock awards Payment, Tax Withholding, Share-Based Payment Arrangement Audit Information [Abstract] Audit Information Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Fortrea’s Omnibus Incentive Plan Fortrea’s Omnibus Incentive Plan [Member] Fortrea’s Omnibus Incentive Plan (Loss) income from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Stock Options Additional Disclosures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Disclosure of non-cash transfers to (from) Former Parent: Disclosure Of Non-Cash Transfers To (From) Former 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