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Equity - Treasury Stock (Details) - USD ($)
shares in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]      
Treasury stock acquired $ 200,000,000 $ 11,953,000  
Repurchase of common stock (200,000,000.0) (19,933,000)  
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    
Treasury Stock Associated with Deferred Compensation Plans      
Equity, Class of Treasury Stock [Line Items]      
Treasury stock acquired $ 3,500,000 $ 3,800,000  
Common Stock Withheld for Settlement of Employee Tax Liabilities      
Equity, Class of Treasury Stock [Line Items]      
Treasury stock acquired (in shares) 0.6 0.4  
Treasury stock acquired $ 23,200,000 $ 15,300,000