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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [abstract] |  |
Operating and financing leases, less than 1 year | $ 17.2 |
Operating and financing leases, 2-3 years | 19.7 |
Operating and financing leases, 4-5 years | 2.7 |
Operating and financing leases, more than 5 years | 0.0 |
Operating and financing leases, total | 39.6 |
Debt, less than 1 year | 0.0 |
Debt, 2-3 years | 250.0 |
Debt, 4-5 years | 0.0 |
Debt, more than 5 years | 0.0 |
Debt total | 250.0 | $ 0.0
Accounts payable and accrued liabilities, less than 1 year | 233.0 | 194.0
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 | 233.0 |
Decommissioning liability, less than 1 year | 6.5 |
Decommissioning liability, 2-3 years | 36.6 |
Decommissioning liability, 4-5 years | 58.7 |
Decommissioning liability, more than 5 years | 92.0 |
Decommissioning liability, total | 193.8 | $ 165.2
Capital commitments, less than 1 year | 131.1 |
Capital commitments, 2-3 years | 6.0 |
Capital commitments, 4-5 years | 0.0 |
Capital commitments, more than 5 years | 0.0 |
Capital commitments, total | 137.1 |
Contractual obligation, less than 1 year | 387.8 |
Contractual obligation, 2-3 years | 62.3 |
Contractual obligation, 4-5 years | 311.4 |
Contractual obligation, more than 5 years | 92.0 |
Contractual obligation, total | $ 853.5 |

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- Definition Accounts Payable and Accrued Liabilities, Maturities, Repayments of Principal after Year Five + References No definition available. + Details
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- Definition Borrowings, Future Minimum Payments, Due After Year 5 + References No definition available. + Details
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- Definition Borrowings, Future Minimum Payments, Due In Next Twelve months + References No definition available. + Details
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- Definition Capital Commitments, Future Minimum Payments Due, Next Twelve Months + References No definition available. + Details
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- Definition Contractual Obligation, Due in Second and Third Year + References No definition available. + Details
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- Definition Longterm Provision For Decommissioning Restoration And Rehabilitation Costs, Repayments of Principal in Next Twelve Months + References No definition available. + Details
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- Definition Operating and Financing Leases, Future Minimum Payments Due + References No definition available. + Details
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- Definition Operating and Financing Leases, Future Minimum Payments Due, Next Twelve Months + References No definition available. + Details
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- Definition Operating and Financing Leases, Future Minimum Payments, Due Thereafter + References No definition available. + Details
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- Definition Operating and Financing Leases, Future Minimum Payments, Due in Four and Five Years + References No definition available. + Details
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- Definition Operating and Financing Leases, Future Minimum Payments, Due in Two and Three Years + References No definition available. + Details
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