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Income Taxes (Components of tax expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income tax [Abstract]    
Current income tax expense $ 12.7 $ 17.3
Deferred income tax expense (recovery) 20.1 16.9
Income tax expense (recovery) recognized in net (loss) earnings $ 32.8 $ 34.2