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Consolidated Statements of Comprehensive Loss - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Profit or loss [abstract]    
OPERATING REVENUES $ 748.1 $ 683.1
COST OF SALES    
Mining and processing 312.6 339.0
Royalties (note 19) 10.2 17.4
COVID costs 6.5 0.0
Amortization 152.7 165.0
Cost of sales 482.0 521.4
EXPENSES    
Exploration 7.2 6.7
Corporate and administrative 21.0 19.8
Share-based compensation (note 11) 10.3 9.2
Total expenses 520.5 557.1
EARNINGS FROM OPERATIONS 227.6 126.0
Finance expense (4.3) (2.5)
Foreign exchange loss (1.4) 0.3
Other (loss) gain (note 12) (3.7) 5.1
EARNINGS BEFORE INCOME TAXES 218.2 128.9
INCOME TAXES (note 10)    
Current income tax expense (30.1) (12.7)
Deferred income tax expense (43.9) (20.1)
NET EARNINGS 144.2 96.1
Items that may be subsequently reclassified to net earnings:    
Unrealized gain on currency hedging instruments, net of taxes 1.1 6.0
Unrealized gain on fuel hedging instruments, net of taxes 0.1 0.5
Items that will not be reclassified to net earnings:    
Unrealized gain on equity securities, net of taxes 23.8 2.5
Total other comprehensive income 25.0 9.0
COMPREHENSIVE INCOME $ 169.2 $ 105.1
EARNINGS PER SHARE (note 11)    
- basic (usd per share) $ 0.37 $ 0.25
- diluted (usd per share) $ 0.37 $ 0.24
Weighted average number of common shares outstanding (000's)    
- basic (in shares) 391,675 390,160
- diluted (in shares) 394,862 393,427