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Stockholders' Equity - Repurchases of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Feb. 08, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Class of Stock        
Payment for shares acquired $ 434.0   $ 445.1 $ 0.0
Percentage of outstanding shares (percent)     13.00%  
Common Stock        
Class of Stock        
Treasury shares acquired (in shares) 37.0 1.2    
Treasury stock price (usd per share) $ 11.72 $ 9.89    
Payment for shares acquired   $ 11.4    
Remaining shares authorized for repurchase   $ 305.0 $ 305.0