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Decommissioning Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure1 [Abstract]  
Schedule of Change in Asset Retirement Obligation
A continuity of the decommissioning liability is as follows:
 
Total
Balance – December 31, 2017
$44.6

Reclamation expenditures
(0.9)

Accretion expense
3.0

Revisions to expected discounted cash flows
(1.8)

Balance – December 31, 2018
$44.9
Reclamation expenditures
(2.0
)
Accretion expense
2.8

Revisions to expected discounted cash flows
13.3

Balance – December 31, 2019
$59.0
Less: Current portion of decommissioning liability
(1.9)

 
$57.1