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Income Taxes (Schedule of Change in Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Balance, beginning of year $ 291.0 $ 284.1
Deferred income tax liability recognized on Richmont Mines acquisition (note 5) 201.5 0.0
Deferred income tax (recovery) expense recognized in net earnings (loss) (16.3) 6.5
Deferred income tax expense recognized in OCI 3.5 0.4
Deferred income tax recovery recognized in equity (2.7) 0.0
Balance, end of year $ 477.0 $ 291.0