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Equity - Treasury Stock (Details) - USD ($) shares in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2020	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired		$ 200,000,000		$ 11,953,000
Repurchase of common stock	$ 0		$ 0		$ 200,000,000	$ 20,092,000
2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased (up to)								$ 500,000,000.0
Amount remaining under stock repurchase programs	86,800,000				86,800,000
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	586,800,000				586,800,000
Treasury Stock Associated with Deferred Compensation Plans
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired	0				3,600,000	3,700,000
Common Stock Withheld for Settlement of Employee Tax Liabilities
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired	$ 800,000		$ 600,000		$ 24,500,000	$ 16,700,000
Treasury stock acquired (in shares)					0.6	0.5

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