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SEGMENT AND CUSTOMER REPORTING - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Total segment income | $ 325.0 | $ 138.0 | $ 726.3 | $ 396.7
Finance costs | 12.8 | 11.2 | 40.0 | 40.2
Miscellaneous expense | 1.3 | 2.8 | 4.4 | 13.8
Employee SBC expense | 15.6 | 12.7 | 56.8 | 47.3
TRS fair value adjustment (TRS FVA): losses (gains) | (113.3) | 7.7 | (191.6) | (39.5)
Amortization of intangible assets (excluding computer software) | 11.4 | 11.1 | 33.6 | 32.0
Restructuring and other charges, net of recoveries | 4.9 | 1.0 | 23.3 | 17.3
Earnings before income taxes | 310.9 | 124.0 | 681.9 | 342.7
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment income | 242.2 | 168.8 | 644.7 | 449.0
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Finance costs | 12.8 | 11.2 | 40.0 | 40.2
Miscellaneous expense | 1.3 | 2.8 | 4.4 | 13.8
Foreign currency forward contracts transitional adjustments | 0.0 | (0.5) | 0.0 | (1.7)
Employee SBC expense | 15.6 | 12.7 | 56.8 | 47.3
TRS fair value adjustment (TRS FVA): losses (gains) | (113.3) | 7.7 | (191.6) | (39.5)
Amortization of intangible assets (excluding computer software) | 10.0 | 9.9 | 29.9 | 28.9
Restructuring and other charges, net of recoveries | 4.9 | 1.0 | 23.3 | 17.3
ATS | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment income | $ 42.8 | $ 40.1 | $ 127.0 | $ 107.1
Segment margin, percentage | 5.50% | 4.90% | 5.30% | 4.60%
CCS | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment income | $ 199.4 | $ 128.7 | $ 517.7 | $ 341.9
Segment margin, percentage | 8.30% | 7.60% | 8.20% | 7.20%

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