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Debt - Schedule of Debt Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]        
Proceeds $ 315.0 $ 167.1    
Advances   16.5    
Repayments (703.5) (5.2)    
Interest 9.4      
Other (7.0)      
Acquisition (Note 8) 927.6      
Disposition (Note 9) (31.5)      
Less: current portion (6.7) (13.7)   $ (3.4)
Non-current 697.0 180.0   $ 11.9
Yamana        
Disclosure of detailed information about borrowings [line items]        
Borrowings recognized as of acquisition date 927.6   $ 943.1  
Senior note maturing December 2027        
Disclosure of detailed information about borrowings [line items]        
Borrowings 0.0      
Proceeds 0.0      
Repayments 0.0      
Interest 1.5      
Other 0.0      
Acquisition (Note 8) 272.3      
Disposition (Note 9) 0.0      
Borrowings 273.8 0.0    
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 0.0      
Proceeds 0.0      
Repayments 0.0      
Interest 6.9      
Other 0.0      
Acquisition (Note 8) 402.9      
Disposition (Note 9) 0.0      
Borrowings 409.8 0.0    
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 160.0 0.0    
Proceeds 315.0 160.0    
Advances   0.0    
Repayments (475.0) 0.0    
Interest 0.0      
Other 0.0      
Acquisition (Note 8) 0.0      
Disposition (Note 9) 0.0      
Borrowings $ 0.0 160.0    
Effective interest rate 5700.00%      
Other        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 33.7 15.3    
Proceeds 0.0 7.1    
Advances   16.5    
Repayments (228.5) (5.2)    
Interest 1.0      
Other (7.0)      
Acquisition (Note 8) 252.4      
Disposition (Note 9) (31.5)      
Borrowings $ 20.1 $ 33.7    
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