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Income Taxes (Components of tax expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of income tax [Abstract]    
Current income tax expense $ 17.3 $ 11.9
Deferred income tax expense (recovery) 16.9 (16.3)
Income tax expense (recovery) recognized in net (loss) earnings $ 34.2 $ (4.4)