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Equity - Treasury Stock (Details) - USD ($) shares in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired		$ 11,953,000	$ 19,993,000	$ 173,913,000
Cash payments related to stock repurchases	$ 159,000		15,993,000		$ 20,092,000	$ 189,906,000
2017 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased (up to)								$ 300,000,000.0
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	286,800,000				286,800,000
Treasury Stock Associated with Deferred Compensation Plans
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired					$ 3,700,000	$ 3,300,000
Common Stock Withheld for Settlement of Employee Tax Liabilities
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired (in shares)					0.5	0.4
Treasury stock acquired	$ 800,000		$ 800,000		$ 16,100,000	$ 14,200,000

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