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SEGMENTED INFORMATION - Statement of Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Revenues $ 1,633.0 $ 987.1
Cost of sales   647.0
Depreciation expense 273.8 216.0
General and administrative 48.9 50.8
Exploration 21.7 26.3
Impairment (455.5) 0.0
Other 9.2 (47.3)
Earnings (loss) from operations 944.0 (0.3)
Net capital expenditures   934.2
9.7% of Côté Gold pre-Commercial Production gold received by SMM 18.4 0.0
9.7% of Côté Gold expenses funded by SMM 6.6 0.0
Other income (expenses) $ 9.2 (47.3)
Côté Gold    
Disclosure of operating segments [line items]    
Proportion of voting rights held in joint venture 70.00%  
Discontinued operations    
Disclosure of operating segments [line items]    
Revenues   47.2
Cost of sales   23.8
Depreciation expense   0.0
General and administrative   0.0
Exploration   0.1
Impairment   0.0
Other   (1.3)
Earnings (loss) from operations   22.0
Net capital expenditures   10.8
Other income (expenses)   (1.3)
Aggregate continuing and discontinued operations    
Disclosure of operating segments [line items]    
Revenues $ 1,633.0 1,034.3
Cost of sales 809.3 670.8
Depreciation expense 273.8 216.0
General and administrative 48.9 50.8
Exploration 21.7 26.4
Impairment (455.5) 0.0
Other 9.2 (48.6)
Earnings (loss) from operations 944.0 21.7
Net capital expenditures 522.0 945.0
Other income (expenses) 9.2 (48.6)
Gold mines    
Disclosure of operating segments [line items]    
Revenues 1,690.5 986.2
Cost of sales 809.3 647.0
Depreciation expense 272.7 214.9
General and administrative 0.0 0.4
Exploration 6.5 4.2
Impairment (455.5) 0.0
Other 11.4 (43.0)
Earnings (loss) from operations 1,068.9 76.7
Net capital expenditures $ 520.4 933.8
Revenue and expenses, percentage 9.70%  
Other income (expenses) $ 11.4 (43.0)
Gold mines | Côté Gold    
Disclosure of operating segments [line items]    
Revenues 284.3 0.0
Cost of sales 115.0 0.0
Depreciation expense 56.7 0.0
General and administrative 0.0 0.4
Exploration 6.5 4.2
Impairment 0.0 0.0
Other (0.5) (1.0)
Earnings (loss) from operations 105.6 (5.6)
Net capital expenditures $ 268.8 731.6
Capital expenditures, percentage 70.00%  
Revenue and expenses, percentage 60.30%  
Other income (expenses) $ (0.5) (1.0)
Gold mines | Essakane    
Disclosure of operating segments [line items]    
Revenues 1,083.2 809.6
Cost of sales 536.8 502.4
Depreciation expense 162.3 183.6
General and administrative 0.0 0.0
Exploration 0.0 0.0
Impairment 0.0 0.0
Other 0.3 (31.6)
Earnings (loss) from operations 384.4 92.0
Net capital expenditures 185.5 136.6
Other income (expenses) 0.3 (31.6)
Gold mines | Westwood complex    
Disclosure of operating segments [line items]    
Revenues 323.0 176.6
Cost of sales 157.5 144.6
Depreciation expense 53.7 31.3
General and administrative 0.0 0.0
Exploration 0.0 0.0
Impairment (455.5) 0.0
Other 11.6 (10.4)
Earnings (loss) from operations 578.9 (9.7)
Net capital expenditures 66.1 65.6
Other income (expenses) 11.6 (10.4)
Exploration and evaluation and development    
Disclosure of operating segments [line items]    
Revenues 0.0 0.0
Cost of sales 0.0 0.0
Depreciation expense 0.0 0.0
General and administrative 0.0 0.0
Exploration 15.2 22.1
Impairment 0.0 0.0
Other (0.7) (0.2)
Earnings (loss) from operations (15.9) (22.3)
Net capital expenditures 0.0 0.0
Other income (expenses) (0.7) (0.2)
Corporate    
Disclosure of operating segments [line items]    
Revenues (57.5) 0.9
Cost of sales 0.0 0.0
Depreciation expense 1.1 1.1
General and administrative 48.9 50.4
Exploration 0.0 0.0
Impairment 0.0 0.0
Other (1.5) (4.1)
Earnings (loss) from operations (109.0) (54.7)
Net capital expenditures 1.6 0.4
Other income (expenses) $ (1.5) $ (4.1)