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Financial Instruments and Risk Management (Contractual Commitments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Disclosure of detailed information about financial instruments [abstract]  
Operating and financing leases, less than 1 year $ 3.1
Operating and financing leases, 2-3 years 1.5
Operating and financing leases, 4-5 years 0.7
Operating and financing leases, more than 5 years 0.6
Operating and financing leases, total 5.9
Accounts payable and accrued liabilities, less than 1 year 118.7
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 118.7
Decommissioning liability, less than 1 year 0.0
Decommissioning liability, 2-3 years 6.4
Decommissioning liability, 4-5 years 0.0
Decommissioning liability, more than 5 years 47.0
Decommissioning liability, total 53.4
Contract mining, less than 1 year 31.9
Contract mining, 2-3 years 32.0
Contract mining, 4-5 years 0.0
Contract mining, more than 5 years 0.0
Contract mining, total 63.9
Capital commitments, less than 1 year 24.5
Capital commitments, 2-3 years 0.0
Capital commitments, 4-5 years 0.0
Capital commitments, more than 5 years 0.0
Capital commitments, total 24.5
Contractual obligation, less than 1 year 178.2
Contractual obligation, 2-3 years 39.9
Contractual obligation, 4-5 years 0.7
Contractual obligation, more than 5 years 47.6
Contractual obligation, total $ 266.4