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Debt - Schedule of Debt Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]        
Proceeds   $ 315.0    
Repayments $ (6.7) (703.5)    
Accrued Interest 11.8 9.4    
Other   (7.0)    
Acquisition (Note 8)   927.6    
Dispositions   (31.5)    
Less: current portion of debt (6.8) (6.7)   $ (13.7)
Non-current portion of debt 702.0 697.0   $ 180.0
Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date     $ 927.6  
Senior note maturing December 2027        
Disclosure of detailed information about borrowings [line items]        
Borrowings 273.8 0.0    
Proceeds   0.0    
Repayments 0.0 0.0    
Accrued Interest 2.1 1.5    
Other   0.0    
Acquisition (Note 8)   272.3    
Dispositions   0.0    
Borrowings 275.9 273.8    
Senior note maturing December 2027 | Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date     283.0  
Senior note maturing August 2031        
Disclosure of detailed information about borrowings [line items]        
Borrowings 409.8 0.0    
Proceeds   0.0    
Repayments 0.0 0.0    
Accrued Interest 9.7 6.9    
Other   0.0    
Acquisition (Note 8)   402.9    
Dispositions   0.0    
Borrowings 419.5 409.8    
Senior note maturing August 2031 | Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date     $ 500.0  
SL-Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0 160.0    
Proceeds   315.0    
Repayments   (475.0)    
Accrued Interest   0.0    
Other   0.0    
Acquisition (Note 8)   0.0    
Dispositions   0.0    
Borrowings 0.0 $ 0.0    
Effective interest rate   5.70%    
Other        
Disclosure of detailed information about borrowings [line items]        
Borrowings 20.1 $ 33.7    
Proceeds   0.0    
Repayments (6.7) (228.5)    
Accrued Interest 0.0 1.0    
Other (7.0) (7.0)    
Acquisition (Note 8)   252.4    
Dispositions   (31.5)    
Borrowings $ 13.4 $ 20.1    
MARA Loan        
Disclosure of detailed information about borrowings [line items]        
Effective interest rate     5.50%  
MARA Loan | Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date     $ 37.0  
Jacobina Loan        
Disclosure of detailed information about borrowings [line items]        
Effective interest rate     5.50%  
Jacobina Loan | Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date     $ 10.3