Equity - Treasury Stock (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Value of treasury stock acquired, cost method	$ 11,954,000	$ 451,290,000	$ 50,000,000
Cash payments related to stock repurchases	20,092,000	443,152,000	50,000,000
2017 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased					$ 300,000,000.0
2018 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount of common stock to be repurchased				$ 500,000,000.0
Remaining authorized share repurchase amount under repurchase program	286,800,000
Treasury Stock Associated with Deferred Compensation Plans
Equity, Class of Treasury Stock [Line Items]
Value of treasury stock acquired, cost method	$ 3,000,000.0	$ 2,500,000	$ 2,600,000
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	0.5
Value of treasury stock acquired, cost method	$ 17,400,000	$ 15,200,000	$ 18,600,000