Share-Based Compensation - Schedule Of Performance Stock Unit Grants (Details) - Performance Shares - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	168,529
Weighted average grant date fair value per share	$ 25.69
Adjusted EBITDA
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	117,975	93,566	64,809
Weighted average grant date fair value per share	$ 25.69	$ 33.32	$ 42.94
Fair value of shares vested (in millions)	$ 2
Contract Sales
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	50,554	40,094	27,769
Weighted average grant date fair value per share	$ 25.69	$ 33.32	$ 42.94
Fair value of shares vested (in millions)	$ 1

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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