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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Subclassifications of assets, liabilities and equities [abstract] |  |
Trade accounts payable and accrued liabilities | $ 104.4 | $ 87.3
Royalties payable | 4.8 | 4.9
Share-based compensation liability (note 16) | 1.6 | 4.5
Current portion of equipment financing obligations | 2.6 | 4.2
Derivative liabilities (note 20) | 5.3 | 0.1
Accounts payable and accrued liabilities | $ 118.7 | $ 101.0

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