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Income Taxes (Components of tax expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income tax [Abstract]    
Current income tax expense $ 30.1 $ 12.7
Deferred income tax expense 43.9 20.1
Income tax expense recognized in net earnings $ 74.0 $ 32.8