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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [abstract]    
Operating and financing leases, less than 1 year $ 0.6  
Operating and financing leases, 2-3 years 0.9  
Operating and financing leases, 4-5 years 0.9  
Operating and financing leases, more than 5 years 0.5  
Operating and financing leases, total 2.9  
Accounts payable and accrued liabilities, less than 1 year 131.4 $ 127.3
Accounts payable and accrued liabilities, 2-3 years 0.0  
Accounts payable and accrued liabilities, 4-5 years 0.0  
Accounts payable and accrued liabilities, more than 5 years 0.0  
Accounts payable and accrued liabilities, total 131.4  
Decommissioning liability, less than 1 year 0.0  
Decommissioning liability, 2-3 years 0.2  
Decommissioning liability, 4-5 years 18.0  
Decommissioning liability, more than 5 years 58.4  
Decommissioning liability, total 76.6  
Contract mining, less than 1 year 64.7  
Contract mining, 2-3 years 81.8  
Contract mining, 4-5 years 42.1  
Contract mining, more than 5 years 25.7  
Contract mining, total 214.3  
Capital commitments, less than 1 year 30.9  
Capital commitments, 2-3 years 5.2  
Capital commitments, 4-5 years 0.0  
Capital commitments, more than 5 years 0.0  
Capital commitments, total 36.1  
Contractual obligation, less than 1 year 227.6  
Contractual obligation, 2-3 years 88.1  
Contractual obligation, 4-5 years 61.0  
Contractual obligation, more than 5 years 84.6  
Contractual obligation, total $ 461.3