v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Total segment income $ 458.3 $ 272.5 $ 730.4 $ 401.3
Reconciling items:        
Finance costs 21.2 14.4 39.2 29.4
Interest income (3.8) (0.9) (5.8) (2.2)
Miscellaneous expense (income) (0.7) 1.7 (0.9) 3.1
Employee SBC expense 19.3 15.2 49.8 41.2
TRS fair value adjustment (TRS FVA): gains (104.1) (97.4) (87.1) (78.3)
Restructuring and other charges (recoveries) 2.9 14.5 (1.5) 18.4
Earnings before income taxes 441.6 257.3 697.9 371.0
Operating Segments        
Segment Reporting [Line Items]        
Total segment income 386.3 214.7 711.5 402.5
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment        
Reconciling items:        
Finance costs 21.2 14.4 39.2 29.4
Interest income (3.8) (0.9) (5.8) (2.2)
Miscellaneous expense (income) (0.7) 1.7 (0.9) 3.1
Employee SBC expense 19.3 15.2 49.8 41.2
TRS fair value adjustment (TRS FVA): gains (104.1) (97.4) (87.1) (78.3)
Amortization of intangible assets (excluding computer software) 9.9 9.9 19.9 19.9
Restructuring and other charges (recoveries) 2.9 14.5 (1.5) 18.4
CCS | Operating Segments        
Segment Reporting [Line Items]        
Total segment income $ 329.9 $ 171.2 $ 607.1 $ 318.3
Segment margin, percentage 8.70% 8.30% 8.60% 8.10%
ATS | Operating Segments        
Segment Reporting [Line Items]        
Total segment income $ 56.4 $ 43.5 $ 104.4 $ 84.2
Segment margin, percentage 6.30% 5.30% 6.20% 5.20%