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Income taxes - Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income taxes    
Deferred income tax (recovery) expense $ 37.1 $ (35.2)
Reconciliation of provision for income taxes    
Net income before income taxes $ 857.8 $ 339.5
Statutory tax rate (as a percent) 26.50% 26.50%
Tax expense at statutory rate $ 227.3 $ 90.0
Change in unrecognized deductible temporary differences (12.9) (6.4)
Income not taxable (6.7) (4.2)
Differences in foreign statutory tax rates (83.6) (66.0)
Differences due to changing future tax rates (1.1) (0.8)
Other 1.1 0.7
Income tax expense (recovery) $ 124.1 $ 13.3