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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Cash Flow Statement [Abstract]
Amounts receivable	$ (7.9)	$ 14.0
Inventory	13.9	(15.9)
Advances and prepaid expenses	(7.2)	(4.3)
Accounts payable and accrued liabilities	7.6	(12.1)
Income taxes (paid) refunded	(4.2)	(1.5)
Increase (decrease) in working capital	2.2	(19.8)
Interest received, classified as investing activities	$ 2.8	$ 2.5

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Adjustments for Accounts Payable and Accrued Liabilities1

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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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The increase (decrease) in working capital.

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The cash inflow from interest received, classified as investing activities.

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