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Consolidated Statements of Changes in Equity - USD ($)
Total
Share capital [Member]
Contributed Surplus [member]
Warrants [member]
Accumulated other comprehensive income (loss) [member]
Accumulated other comprehensive income (loss) [member]
Equity securities [member]
Accumulated other comprehensive income (loss) [member]
Currency hedging instruments [member]
Deficit [member]
Beginning balance at Dec. 31, 2015   $ 2,773,700,000 $ 69,200,000 $ 0   $ (4,400,000) $ 0 $ (1,114,300,000)
Changes in equity [abstract]                
Issuance of shares related to Richmont acquisition (note 5)   0            
Issuance of shares through bought deal financing, net of issuance costs and deferred taxes   0            
Issuance of shares related to Carlisle acquisition   17,500,000            
Issuance of shares related to share-based compensation   7,400,000 0          
Issuance of shares related to exercise of warrants   1,200,000            
Issuance of shares through flow-through share agreements   20,100,000            
Share-based compensation     4,400,000          
Fair value of share-based compensation redeemed   2,300,000 (3,100,000)          
Shares issued related to the merger (note x)     0          
Equity settled share-based payments related to Carlisle acquisition     400,000          
Issuance of warrants related to Carlisle acquisition       2,800,000        
Issuance of warrants, pursuant to the exercise of Carlisle equity instruments       700,000        
Realized disposition on equity securities, reclassified to net loss $ (300,000)         (300,000)    
Unrealized gains on equity securities, net of taxes 5,100,000         5,100,000    
Unrealized gain on currency hedging instruments, net of taxes 0           0  
Dividends (note13(f))               (5,400,000)
Net earnings (loss) (17,900,000.0)             (17,900,000)
Ending balance at Dec. 31, 2016 1,759,400,000 2,822,200,000 70,900,000 3,500,000 $ 400,000 400,000 0 (1,137,600,000)
Changes in equity [abstract]                
Issuance of shares related to Richmont acquisition (note 5)   615,300,000            
Issuance of shares through bought deal financing, net of issuance costs and deferred taxes   241,800,000            
Issuance of shares related to Carlisle acquisition   0            
Issuance of shares related to share-based compensation   2,300,000 1,300,000          
Issuance of shares related to exercise of warrants   500,000            
Issuance of shares through flow-through share agreements   8,400,000            
Share-based compensation     6,400,000          
Fair value of share-based compensation redeemed   1,200,000 (1,200,000)          
Shares issued related to the merger (note x)     12,100,000          
Equity settled share-based payments related to Carlisle acquisition     0          
Issuance of warrants related to Carlisle acquisition       0        
Issuance of warrants, pursuant to the exercise of Carlisle equity instruments       500,000        
Realized disposition on equity securities, reclassified to net loss 0         0    
Unrealized gains on equity securities, net of taxes 0         6,600,000    
Unrealized gain on currency hedging instruments, net of taxes 6,000,000           6,000,000  
Dividends (note13(f))               (6,000,000)
Net earnings (loss) 26,600,000             26,600,000
Ending balance at Dec. 31, 2017 $ 2,681,200,000 $ 3,691,700,000 $ 89,500,000 $ 4,000,000 $ 13,000,000 $ 7,000,000 $ 6,000,000 $ (1,117,000,000)