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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Earnings (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax       $ (10,800,000)  
Stockholders' Equity Note, Spinoff Transaction   $ (1,780,100,000)      
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of accumulated other comprehensive earnings (loss) are as follows:
Foreign Currency Translation AdjustmentsNet Benefit Plan AdjustmentsAccumulated Other Comprehensive Earnings (Loss)
Balance as of December 31, 2022$(462.3)$(30.9)$(493.2)
Fortrea Holdings Inc. spin off231.6 6.4 238.0 
Current year adjustments43.8 17.6 61.4 
Pension settlement charge— (10.8)(10.8)
Amounts reclassified from accumulated other comprehensive income— (3.4)(3.4)
Tax effect of adjustments— (0.8)(0.8)
Balance as of September 30, 2023$(186.9)$(21.9)$(208.8)
        
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax       17,600,000  
Other Comprehensive Income (Loss), before Reclassifications, before Tax       61,400,000  
Accumulated Other Comprehensive Earnings [Roll Forward]          
Foreign Currency Translation Adjustments, Beginning balance       (462,300,000)  
Other comprehensive income before reclassifications       43,800,000  
Tax effect of adjustments       0  
Foreign Currency Translation Adjustments, Ending balance $ (186,900,000)     (186,900,000)  
Net Benefit Plan Adjustments, Beginning balance       (30,900,000)  
Tax effect of adjustments       (800,000)  
Net Benefit Plan Adjustments, Ending balance (21,900,000)     (21,900,000)  
Accumulated Other Comprehensive Earnings, Beginning balance       (493,200,000)  
Other comprehensive income before reclassifications       43,800,000  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax       0  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax       (3,400,000)  
Tax effect of adjustments (200,000)   $ (300,000) (800,000) $ (1,100,000)
Accumulated Other Comprehensive Earnings, Ending balance (208,800,000)     (208,800,000)  
Pension settlement charge          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax       0  
Stockholders' Equity Note, Spinoff Transaction       231,600,000  
Net Benefit Plan Adjustments          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Stockholders' Equity Note, Spinoff Transaction       $ 6,400,000  
Accumulated Other Comprehensive Income [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Stockholders' Equity Note, Spinoff Transaction $ 238,000,000.0 $ 238,000,000.0