CAPITAL STOCK - Schedule of SBC Expense and TRS Fair Value Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	$ 30.5	$ 26.0
Total TRS FVAs: losses	17.0	19.1
Combined effect of employee SBC expense and TRS FVAs	47.5	45.1
Cost of sales
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	13.6	10.1
Total TRS FVAs: losses	7.5	7.5
SG&A
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	16.9	15.9
Total TRS FVAs: losses	9.5	11.6
SG&A \| Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee SBC expense	$ 0.6	$ 0.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details