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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (reversal)	$ 41.9	$ 43.7	$ 142.6	$ 150.8
ATC TIPL | Discontinued Operations, Disposed of by Sale
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense included in discontinued operations		$ 6.8	0.0	$ 10.9
Executive Vice President and President, APAC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (reversal)			$ (7.1)

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