v3.25.2
SEGMENT AND CUSTOMER REPORTING - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Total segment income $ 272.5 $ 132.9 $ 401.3 $ 258.7
Finance costs 13.5 15.0 27.2 29.0
Miscellaneous expense 1.7 4.4 3.1 11.0
Employee SBC expense 15.2 11.9 41.2 34.6
Total return swap (TRS) fair value adjustments (97.4) (15.7) (78.3) (47.2)
Amortization of intangible assets (excluding computer software) 11.1 10.7 22.2 20.9
Restructuring and other charges, net of recoveries 14.5 11.5 18.4 16.3
Earnings before income taxes 257.3 113.5 371.0 218.7
Operating Segments        
Segment Reporting Information [Line Items]        
Total segment income 214.7 149.6 402.5 280.2
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Finance costs 13.5 15.0 27.2 29.0
Miscellaneous expense 1.7 4.4 3.1 11.0
Foreign currency forward contracts transitional adjustments 0.0 (0.7) 0.0 (1.2)
Employee SBC expense 15.2 11.9 41.2 34.6
Total return swap (TRS) fair value adjustments (97.4) (15.7) (78.3) (47.2)
Amortization of intangible assets (excluding computer software) 9.9 9.7 19.9 19.0
Restructuring and other charges, net of recoveries 14.5 11.5 18.4 16.3
ATS | Operating Segments        
Segment Reporting Information [Line Items]        
Total segment income $ 43.5 $ 35.1 $ 84.2 $ 67.0
Segment margin, percentage 5.30% 4.60% 5.20% 4.40%
CCS | Operating Segments        
Segment Reporting Information [Line Items]        
Total segment income $ 171.2 $ 114.5 $ 318.3 $ 213.2
Segment margin, percentage 8.30% 7.00% 8.10% 7.00%