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Income Taxes (Schedule of Change in Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Balance, beginning of year $ 660.9 $ 623.2
Deferred income tax expense recognized in net earnings 31.0 54.6
Deferred income tax (recovery) expense recognized in OCI 2.7 (1.0)
Deferred tax liability derecognized on sale of Esperanza Project 0.0 (15.9)
Balance, end of year $ 694.6 $ 660.9