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Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments [Line Items]    
Capital purchases commitments $ 123.8 $ 36.1
Royalties 11.7 10.2
Royal Gold [Member]    
Commitments [Line Items]    
Extraordinary mining duty tax 1.1 1.3
Island Gold [Member]    
Commitments [Line Items]    
Royalties 5.3 5.2
Net Smelter Royalty [Member] | AuRico Metals [Member]    
Commitments [Line Items]    
Royalties $ 5.3 3.3
Royalty rate 1.50%  
Net Smelter Royalty [Member] | Island Gold [Member]    
Commitments [Line Items]    
Royalty rate 2.20%  
Other Royalties [Member] | AuRico Metals [Member]    
Commitments [Line Items]    
Royalties   $ 0.4