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Financial Instruments and Risk Management (Contractual Commitments) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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 |

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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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