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Stockholders' Equity (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 28, 2021
Apr. 30, 2021
Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Increase (decrease) in authorization amount           $ 325,300,000 $ 211,400,000
Treasury stock, acquired (in shares) 4,100,000 0 14,100,000 2,600,000      
Value of treasury stock acquired $ 190,000,000.0   $ 551,400,000 $ 187,500,000      
Payments for repurchase of common stock     551,400,000 187,500,000      
Subsequent Event              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Authorized amount of stock to be repurchased         $ 600,000,000    
Performance-based Restricted Stock Units              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Value of treasury stock acquired 300,000 $ 100,000 14,400,000 $ 12,100,000      
February 2016 Program              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Remaining shares under share repurchase authorization $ 186,900,000   $ 186,900,000