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Income Taxes (Components of tax expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of income tax [Abstract]    
Current income tax expense $ 10.7 $ 5.3
Deferred income tax expense 54.6 63.7
Income tax expense recognized in net earnings $ 65.3 $ 69.0