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Treasury Stock (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 30, 2020
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jan. 31, 2020
Equity, Class of Treasury Stock [Line Items]              
Stock repurchase program, authorized amount             $ 1,000,000,000
Available to repurchase common stock     $ 625,600,000   $ 625,600,000    
Amount expended on share repurchases in open market transactions           $ 199,903,000  
Number of shares withheld to satisfy minimum tax withholding obligations (in shares)     32,312 25,826 761,496 765,426  
Payment for tax withholding related to vested stock units     $ 3,400,000 $ 3,700,000 $ 105,100,000 $ 104,800,000  
ASR Counterparty [Member]              
Equity, Class of Treasury Stock [Line Items]              
Amount expended on share repurchases in open market transactions $ 1,000,000,000            
Stock repurchases net (shares) 6,500,000 800,000          
Open Market Purchases [Member]              
Equity, Class of Treasury Stock [Line Items]              
Amount expended on share repurchases in open market transactions     $ 0 $ 0 $ 0 $ 199,900,000  
Stock repurchases net (shares)           1,731,500  
Average per share price on share repurchases in open market transactions (in dollars per share)           $ 115.45