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, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 08, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Class of Stock          
Shares authorized for repurchase (in shares) 750,000,000        
Payment for shares acquired $ 434.0 $ 51.0 $ 62.5 $ 496.1 $ 0.0
Percentage of outstanding shares (percent)       13.00%  
Common Stock          
Class of Stock          
Treasury shares acquired (in shares) 37,000,000 5,600,000 6,800,000    
Treasury stock price (usd per share) $ 11.72 $ 9.06 $ 9.20    
Remaining shares authorized for repurchase   $ 254.0 $ 254.0 $ 254.0