v3.24.1.1.u2
STOCK COMPENSATION PLANS - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jul. 18, 2023
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Cliff vesting period   3 years
Unrecognized compensation cost   $ 119.3
Unrecognized compensation cost, recognition period   2 years
Fortrea’s Omnibus Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized for future issuance (in shares)   11.0
Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized for future issuance (in shares)   1.8
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares converted (in shares) 2.5  
Award vesting period   3 years
Restricted Stock Units | Year one    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage   33.00%
Restricted Stock Units | Year two    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage   33.00%
Restricted Stock Units | Year three    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage   33.00%
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares converted (in shares) 0.1  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   3 years
Exercise period   10 years