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Stockholders' Equity - Repurchase of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended 12 Months Ended
Feb. 08, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition          
Shares authorized for repurchase $ 750.0        
Stock repurchased $ 434.0   $ 507.1 $ 0.0 $ 0.0
Stock repurchased, as a percent of issued and outstanding common stock     13.00%    
Common Stock          
Business Acquisition          
Shares authorized for repurchase   $ 243.0 $ 243.0    
Stock repurchased (in shares) 37.0 7.8      
Stock repurchase price (in dollars per share) $ 11.72 $ 9.45      
Stock repurchased   $ 73.5