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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	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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Disclosure of Cash Flow Statement [Abstract]

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Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in trade accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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The cash flows from income taxes paid or refunded.

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