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Stock-based Compensation - Options Outstanding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional disclosures
Compensation expense recognized	$ 7.1	$ 3.8	$ 3.5
Period over which cost will be recognized	3 years
Stock option awards
Additional disclosures
Compensation expense recognized		$ 0.1	$ 0.2

X

- Definition

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

+ References

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-Publisher FASB
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