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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Expense (Details) - Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Unrecognized compensation
Unrecognized compensation cost related to unvested awards (in dollars)	$ 16.2
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized	1 year 10 months 24 days

X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- References

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