Stock Compensation - RSUs Additional Information (Details) - Restricted Stock Units (RSUs) - 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	$ 2.4	$ 2.1	$ 6.4	$ 5.4
Stock-based compensation capitalized into inventory	0.4		0.6
Unrecognized stock-based compensation expense, RSUs	$ 23.6		$ 23.6
Weighted-average period over which remaining unrecognized compensation cost will be recognized			3 years
Maximum
Stock compensation
Stock-based compensation capitalized into inventory		$ 0.1		$ 0.1

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

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