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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
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 0.6  
Operating and financing leases, 4-5 years 0.0  
Operating and financing leases, more than 5 years 0.0  
Operating and financing leases, total 1.1  
Accounts payable and accrued liabilities, less than 1 year 195.0 $ 172.7
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 195.0  
Decommissioning liability, less than 1 year 12.6  
Decommissioning liability, 2-3 years 31.5  
Decommissioning liability, 4-5 years 51.4  
Decommissioning liability, more than 5 years 69.7  
Decommissioning liability, total 165.2 $ 134.0
Capital commitments, less than 1 year 87.5  
Capital commitments, 2-3 years 32.7  
Capital commitments, 4-5 years 0.0  
Capital commitments, more than 5 years 0.0  
Capital commitments, total 120.2  
Contractual obligation, less than 1 year 295.6  
Contractual obligation, 2-3 years 64.8  
Contractual obligation, 4-5 years 51.4  
Contractual obligation, more than 5 years 69.7  
Contractual obligation, total $ 481.5