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Income Taxes (Components of tax expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income tax [Abstract]    
Current income tax expense $ 11.9 $ 3.8
Deferred income tax (recovery) expense (16.3) 6.5
Income tax (recovery) expense recognized in net loss $ (4.4) $ 10.3