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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Cash Flow Statement [Abstract]
Amounts receivable	$ (8.8)	$ 2.0
Inventory net realizable value adjustment (note 6)	(55.2)	(49.7)
Advances and prepaid expenses	2.3	3.5
Accounts payable and accrued liabilities	(0.1)	16.7
Income taxes (paid) refunded	(1.3)	(26.9)
Increase (decrease) in working capital	$ (63.1)	$ (54.4)

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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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The cash flows from income taxes paid or refunded.

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