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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Finance Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Finance expense    
Accretion on reclamation and remediation obligations $ (37.0) $ (25.5)
Interest expense, including accretion of debt and lease liabilities (69.0) (68.2)
Finance expense (106.0) (93.7)
Capitalized interest 108.9 66.5
Accretion of lease liabilities 2.1 2.6
Total interest paid, including interest capitalized 167.3 96.1
Cost    
Finance expense    
Capitalized interest $ 108.9 $ 66.5