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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Finance Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finance expense    
Accretion on reclamation and remediation obligations $ (23.0) $ (31.0)
Interest expense, including accretion on debt (89.6) (76.9)
Finance expense (112.6) (107.9)
Capitalized interest 49.1 47.4
Accretion of lease liabilities 3.0 2.9
Total interest paid, including interest capitalized 111.0 100.6
Cost    
Finance expense    
Capitalized interest $ 49.1 $ 47.4