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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Current tax expense (recovery)    
Recognized in profit or loss in current year $ 245.3 $ 132.7
Change in current tax expense estimated for prior years 46.0 0.2
Current tax expense (income) and adjustments for current tax of prior periods 291.3 132.9
Deferred tax expense (recovery)    
Deferred tax expense (recovery) recognized in the current year 42.4 (101.7)
Adjustments recognized in the current year with respect to prior years (2.4) 3.4
Impact of tax rate changes 0.5 0.0
Derecognition of previously recognized deferred tax assets 18.3 3.7
Benefit from previously unrecognized losses, and other temporary differences (12.9) 0.0
Impact of impairments on deferred tax assets and liabilities 0.0 (3.4)
Increase (decrease) in deferred tax liabilities due to tax impact of net realizable adjustments to inventories (18.2) 11.2
Deferred tax expense 27.7 (86.8)
Income taxes expense $ 319.0 $ 46.1