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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax $ 116.4 $ 51.9
Changes in tax rates or imposition of new taxes 0.2 0.0
Deferred income taxes 13.0 (21.2)
Total income tax expense (recovery) 129.4 30.7
Canadian income taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax 11.6 3.6
Deferred income taxes - origination and reversal of temporary differences 7.3 0.0
Foreign income taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax 104.8 48.3
Deferred income taxes - origination and reversal of temporary differences $ 5.5 $ (21.2)