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Equity - Treasury Stock (Details) - USD ($) shares in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired		$ 200,000,000		$ 11,953,000
Repurchase of common stock	$ 0		$ 159,000		$ 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
Treasury Stock Associated with Deferred Compensation Plans
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired	$ 100,000				$ 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 (in shares)	0.1		0.1		0.6	0.5
Treasury stock acquired	$ 500,000		$ 800,000		$ 23,700,000	$ 16,100,000

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