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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Subclassifications of assets, liabilities and equities [abstract] |  |
Trade accounts payable and accrued liabilities | $ 87.3 | $ 75.6
Royalties payable | 4.9 | 3.6
Interest payable | 0.0 | 6.1
Share-based compensation liability (note 16) | 4.5 | 6.8
Derivative liabilities (note 20) | 0.1 | 2.4
Accounts payable and accrued liabilities | $ 96.8 | $ 94.5

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