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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]    
Operating and financing leases, less than 1 year $ 0.5  
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 0.0  
Operating and financing leases, total 2.3  
Accounts payable and accrued liabilities, less than 1 year 157.4 $ 131.4
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 157.4  
Decommissioning liability, less than 1 year 3.3  
Decommissioning liability, 2-3 years 21.7  
Decommissioning liability, 4-5 years 23.9  
Decommissioning liability, more than 5 years 66.0  
Decommissioning liability, total 114.9  
Contract mining, less than 1 year 65.5  
Contract mining, 2-3 years 51.2  
Contract mining, 4-5 years 38.8  
Contract mining, more than 5 years 9.3  
Contract mining, total 164.8  
Capital commitments, less than 1 year 71.2  
Capital commitments, 2-3 years 26.3  
Capital commitments, 4-5 years 26.3  
Capital commitments, more than 5 years 0.0  
Capital commitments, total 123.8  
Contractual obligation, less than 1 year 297.9  
Contractual obligation, 2-3 years 100.1  
Contractual obligation, 4-5 years 89.9  
Contractual obligation, more than 5 years 75.3  
Contractual obligation, total $ 563.2