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Equity - Treasury Stock (Details) - USD ($)
shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2020
Sep. 30, 2018
Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]            
Value of treasury stock acquired, cost method $ 249,949,000 $ 11,954,000 $ 451,290,000      
Cash payments related to stock repurchases 247,249,000 20,092,000 443,152,000      
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  
2020 Repurchase Program            
Equity, Class of Treasury Stock [Line Items]            
Aggregate authorized amount of common stock to be repurchased       $ 500,000,000.0    
2018 And 2020 Repurchase Program            
Equity, Class of Treasury Stock [Line Items]            
Remaining authorized share repurchase amount under repurchase program 536,800,000          
Treasury Stock Associated with Deferred Compensation Plans            
Equity, Class of Treasury Stock [Line Items]            
Net amounts recorded to treasury stock related to the deferred compensation plans $ (4,400,000) $ 3,000,000.0 $ 2,500,000      
Common Stock Withheld for Settlement of Employee Tax Liabilities            
Equity, Class of Treasury Stock [Line Items]            
Treasury stock acquired (in shares) 0.6 0.5 0.4      
Value of treasury stock acquired, cost method $ 25,500,000 $ 17,400,000 $ 15,200,000