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Equity - Stock Repurchases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Aug. 31, 2020	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock	$ 19,474,000	$ 200,000,000
2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased (up to)				$ 500,000,000
2020 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased (up to)			$ 500,000,000
2018 and 2020 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Amount remaining under stock repurchase programs	$ 519,100,000

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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