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Income taxes - Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income taxes    
Deferred income tax (recovery) expense $ (35.2) $ 22.7
Net income before income taxes $ 339.5 $ 405.9
Statutory tax rate (as a percent) 26.50% 26.60%
Tax expense at statutory rate $ 90.0 $ 108.0
Change in unrecognized deductible temporary differences (6.4) (0.1)
Income/expenses not taxed (4.2) (4.3)
Differences in foreign statutory tax rates (66.0) (42.8)
Differences due to changing future tax rates (0.8) (1.0)
Foreign withholding tax   0.3
Temporary differences subject to initial recognition exemption 0.6 1.5
Other 0.1 0.2
Income tax expense $ 13.3 $ 61.8