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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Finance Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Finance expense    
Accretion on reclamation and remediation obligations $ (25.5) $ (10.6)
Interest expense, including accretion of debt and lease liabilities (68.2) (71.6)
Finance expense (93.7) (82.2)
Capitalized interest 66.5 48.3
Accretion of lease liabilities 2.6 3.8
Total interest paid, including interest capitalized 96.1 94.7
Cost    
Finance expense    
Capitalized interest $ 66.5 $ 48.3