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Stock-Based Compensation Plans - Restricted Stock Units Narrative (Details) - Restricted Stock Units (RSUs) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Compensation expense for stock options	$ 7.4
Unrecognized compensation cost related to unvested options	$ 41.8
Unrecognized compensation cost related to unvested options, weighted-average period of recognition	3 years 5 months 12 days

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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