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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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 0.2  
Operating and financing leases, more than 5 years 0.0  
Operating and financing leases, total 1.6  
Accounts payable and accrued liabilities, less than 1 year 181.2 $ 157.4
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 181.2  
Decommissioning liability, less than 1 year 8.5  
Decommissioning liability, 2-3 years 43.3  
Decommissioning liability, 4-5 years 12.0  
Decommissioning liability, more than 5 years 70.2  
Decommissioning liability, total 134.0 $ 114.9
Contract mining, less than 1 year 43.0  
Contract mining, 2-3 years 52.4  
Contract mining, 4-5 years 30.1  
Contract mining, more than 5 years 0.0  
Contract mining, total 125.5  
Capital commitments, less than 1 year 124.8  
Capital commitments, 2-3 years 30.6  
Capital commitments, 4-5 years 0.0  
Capital commitments, more than 5 years 0.0  
Capital commitments, total 155.4  
Contractual obligation, less than 1 year 358.0  
Contractual obligation, 2-3 years 127.2  
Contractual obligation, 4-5 years 42.3  
Contractual obligation, more than 5 years 70.2  
Contractual obligation, total $ 597.7