CAPITAL STOCK - Schedule of SBC Expense and TRS Fair Value Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	$ 26.0	$ 22.7
Total TRS FVAs losses (gains)	19.1	(31.5)
Combined effect of employee SBC expense and TRS FVAs	45.1	(8.8)
Cost of sales
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	10.1	8.9
Total TRS FVAs losses (gains)	7.5	(12.8)
SG&A
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	15.9	13.8
Total TRS FVAs losses (gains)	11.6	(18.7)
SG&A | Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	$ 0.6	$ 0.6