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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax $ 51.9 $ 77.6
Deferred income tax (21.2) 0.5
Total income tax expense 30.7 78.1
Canadian current income taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax 3.6 1.6
Foreign current income taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current income tax 48.3 76.0
Foreign deferred income taxes - origination and reversal of temporary differences $ (21.2) $ 0.5