Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Repurchases of Common Stock (Details)

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Stockholders' Equity - Repurchases of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Class of Stock      
Payment for shares acquired   $ 1.7 $ 35.7
Remaining shares authorized for repurchase $ 185.0 185.0  
Common Stock      
Class of Stock      
Stock repurchase program, authorized amount $ 750.0 $ 750.0  
Treasury shares acquired (in shares) 0.1    
Payment for shares acquired $ 1.7    
Treasury stock price (usd per share) $ 20.45