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Income Taxes (Schedule of Change in Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Balance, beginning of year $ 559.9 $ 513.7
Deferred income tax expense recognized in net earnings 63.7 43.9
Deferred income tax (recovery) expense recognized in OCI (0.4) 2.3
Balance, end of year $ 623.2 $ 559.9