Stock Compensation - Stock Options Additional Information (Details) - Common shares under option - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock compensation
Stock-based compensation expense	$ 2.8	$ 5.1	$ 12.7	$ 16.2
Stock-based compensation capitalized into inventory	0.8		1.3
Unrecognized stock-based compensation expense, options	$ 15.3		$ 15.3
Weighted-average period over which remaining unrecognized compensation cost will be recognized			2 years 6 months
Maximum
Stock compensation
Stock-based compensation capitalized into inventory		$ 0.1		$ 0.5

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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