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Acquisition of Richmond Mines Ltd. (Schedule of Asset Acquisition) (Details) - USD ($)
$ in Millions
Nov. 23, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net assets acquired        
Cash and cash equivalents   $ 206.0 $ 200.8 $ 252.2
Equity securities   7.8 35.8  
Mineral property, plant and equipment   2,813.3 2,753.4  
Current liabilities   (124.9) (113.2)  
Deferred tax liabilities   $ (491.5) $ (477.0)  
Richmont Mines Ltd [Member]        
Consideration transferred        
Common shares issued $ 615.3      
Replacement of long-term incentive instruments 12.1      
Consideration transferred 627.4      
Net assets acquired        
Cash and cash equivalents 46.2      
Equity securities 11.7      
Current assets, excluding cash and cash equivalents and equity securities 22.5      
Mineral property, plant and equipment 774.3      
Current liabilities (21.2)      
Long-term liabilities (4.6)      
Deferred tax liabilities (201.5)      
Net assets acquired $ 627.4