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Income Taxes (Schedule of Change in Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Balance, beginning of year $ 513.7 $ 491.5
Deferred income tax expense recognized in net earnings 43.9 20.1
Deferred income tax expense recognized in OCI 2.3 2.1
Balance, end of year $ 559.9 $ 513.7