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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Total segment income | $ 128.8 | $ 125.8
Finance costs | 13.7 | 14.0
Miscellaneous expense | 1.4 | 6.6
Employee SBC expense | 26.0 | 22.7
Total return swap (TRS) fair value adjustments | 19.1 | (31.5)
Amortization of intangible assets (excluding computer software) | 11.1 | 10.2
Restructuring and other charges, net of recoveries | 3.9 | 4.8
Earnings before income taxes | 113.7 | 105.2
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total segment income | 187.8 | 130.6
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |
Segment Reporting Information [Line Items] |  |
Finance costs | 13.7 | 14.0
Miscellaneous expense | 1.4 | 6.6
Foreign currency forward contracts transitional adjustments | 0.0 | (0.5)
Employee SBC expense | 26.0 | 22.7
Total return swap (TRS) fair value adjustments | 19.1 | (31.5)
Amortization of intangible assets (excluding computer software) | 10.0 | 9.3
Restructuring and other charges, net of recoveries | 3.9 | 4.8
ATS | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total segment income | $ 40.7 | $ 31.9
Segment margin, percentage | 5.00% | 4.20%
CCS | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total segment income | $ 147.1 | $ 98.7
Segment margin, percentage | 8.00% | 6.80%

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