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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 02, 2021
Jun. 30, 2021
May 02, 2018
Equity, Class of Treasury Stock [Line Items]              
Stock repurchase program, authorized amount             $ 1,000.0
Stock repurchase program, remaining authorizations $ 970.1   $ 970.1     $ 375.2  
Number of shares repurchased (in shares) 527,058 521,498 6,585,112 521,498      
Value of shares repurchased $ 29.9 $ 20.0 $ 327.7 $ 20.0      
Shares acquired, average price per share (in usd per share) $ 56.75 $ 38.37 $ 49.77 $ 38.37      
Common Stock              
Equity, Class of Treasury Stock [Line Items]              
Number of shares repurchased (in shares)     35,100        
Value of shares repurchased $ 1.6   $ 1.6        
New Share Repurchase Program              
Equity, Class of Treasury Stock [Line Items]              
Stock repurchase program, authorized amount         $ 1,000.0