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Decommissioning Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure1 [Abstract]  
Schedule of Change in Asset Retirement Obligation A continuity of the decommissioning liability is as follows:
Total
Balance – current and non-current portion December 31, 2019$59.0
Reclamation expenditures(3.5)
Accretion expense2.6
Revisions to expected discounted cash flows17.1
Balance – current and non-current portion December 31, 2020$75.2
Reclamation expenditures(1.2)
Accretion expense2.3
Revisions to expected discounted cash flows29.8
Balance – current and non-current portion December 31, 2021$106.1
Less: Current portion of decommissioning liability 1
(3.3)
Balance – non-current portion December 31, 2021$102.8
1. The current portion of decommissioning liability is included in accounts payable and accrued liabilities (note 9).