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Production Costs - Employee Compensation and Benefits Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Production Costs [Line Items]    
Wages, salaries and bonuses $ 589.6 $ 536.6
Share-based compensation 0.4 5.5
Total employee compensation and benefit expenses 590.0 542.1
Less: Expensed within General and Administrative expenses (45.8) (38.8)
Less: Expensed within Mine Care and Maintenance expenses (10.1) (26.8)
Less: Expensed within Exploration expenses (3.0) (4.8)
Employee compensation and benefits expenses included in production costs 531.1 471.7
Write downs (recoveries) $ 20.6 (31.8)
Yamana    
Production Costs [Line Items]    
Inventory acquisition date fair value adjustments   $ 41.1