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Income Taxes (Provision for income taxes) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current tax:    
Canada $ 0.2 $ 0.0
Luxembourg 0.2 0.3
Current tax expense 0.4 0.3
Deferred tax expense (recovery):    
Canada (225.6) (690.5)
United States 66.2 (248.3)
Deferred tax expense (recovery) (159.4) (938.8)
Income tax recovery $ (159.0) $ (938.5)