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Financial risk management - Exposure to currency risk (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EXPOSURE TO CURRENCY RISK      
Cash and cash equivalents $ 186.3 $ 83.4 $ 103.7
Deferred tax liability (53.5) (48.3)  
Reclamation and closure cost obligations (119.2) (107.0) $ (92.6)
Canadian dollar | Currency risk      
EXPOSURE TO CURRENCY RISK      
Cash and cash equivalents 34.6 11.0  
Trade and other receivables 53.5 7.0  
Income tax (payable) receivable (0.7) (0.3)  
Trade and other payables (80.1) (86.8)  
Deferred tax liability (53.5) (48.3)  
Reclamation and closure cost obligations (113.3) (93.3)  
Share units (10.9) (1.9)  
Total exposure to currency risk (170.4) (212.6)  
Mexican peso | Currency risk      
EXPOSURE TO CURRENCY RISK      
Cash and cash equivalents 0.1 0.3  
Trade and other receivables 1.6 0.9  
Income tax (payable) receivable 4.1 4.6  
Trade and other payables (6.5) (13.5)  
Deferred tax liability 0.0 0.0  
Reclamation and closure cost obligations (0.3) (1.4)  
Share units 0.0 0.0  
Total exposure to currency risk $ (1.0) $ (9.1)