v3.26.1
BUSINESS SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues $ 636.5 $ 651.3
Direct costs 512.9 534.8
Selling, general and administrative expenses 100.5 121.8
Depreciation 19.8 19.5
Goodwill and other asset impairments 0.0 488.8
Operating loss (3.4) (520.1)
Interest expense (19.1) (22.3)
Foreign exchange gain (loss) 9.7 (5.6)
Other, net 0.5 0.0
Loss before income taxes (12.3) (548.0)
Corporate, non-segment    
Segment Reporting Information [Line Items]    
Corporate costs not included in segment operating income 11.5 17.8
Clinical Services Segment    
Segment Reporting Information [Line Items]    
Amortization 14.6 14.5
Restructuring and other charges 6.7 6.5
Operating loss (3.4) (520.1)
Interest expense (19.1) (22.3)
Foreign exchange gain (loss) 9.7 (5.6)
Other, net 0.5 0.0
Loss before income taxes (12.3) (548.0)
Clinical Services Segment | Operating segments    
Segment Reporting Information [Line Items]    
Revenues 636.5 651.3
Pass through costs 229.9 239.9
Direct costs 282.9 294.1
Selling, general and administrative expenses 89.1 104.8
Depreciation 5.2 5.0
Segment operating income $ 29.4 $ 7.5