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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Finance Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finance expense    
Accretion on reclamation and remediation obligations $ (14.2) $ (23.0)
Interest expense, including accretion of debt and lease liabilities (71.5) (89.6)
Finance expense (85.7) (112.6)
Capitalized interest 48.3 49.1
Accretion of lease liabilities 3.8 3.0
Total interest paid, including interest capitalized 98.0 111.0
Cost    
Finance expense    
Capitalized interest $ 48.3 $ 49.1