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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Cash Flow Statement [Abstract] |  |
Amounts receivable | $ 14.0 | $ (5.7)
Inventory | (15.9) | (16.1)
Advances and prepaid expenses | (4.3) | 3.8
Accounts payable and accrued liabilities | (12.1) | (7.5)
Income taxes (paid) refunded | (1.5) | 13.2
Increase (decrease) in working capital | (19.8) | (12.3)
Interest received, classified as investing activities | $ 2.5 | $ 2.1

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