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Stockholders' Equity - Textual (Details)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended 45 Months Ended
Aug. 14, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2020
USD ($)
numberOfVote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
numberOfVote
$ / shares
shares
Oct. 30, 2018
USD ($)
Apr. 25, 2018
USD ($)
Aug. 01, 2017
USD ($)
Apr. 02, 2017
shares
Class of Stock [Line Items]                    
Common Stock, shares authorized (in shares)     450,000,000.0 450,000,000.0   450,000,000.0        
Common Stock, par value per share (in dollars per share) | $ / shares     $ 0.01 $ 0.01   $ 0.01        
Number of vote per common stock | numberOfVote     1     1        
Preferred Stock, shares authorized (in shares)     100,000,000.0     100,000,000.0        
Preferred Stock, shares outstanding (in shares)   13,500,000 0   0 0        
Common Stock, shares outstanding (in shares)   105,200,000 97,800,000 96,900,000 110,400,000 97,800,000        
Stock repurchase program, authorized amount | $             $ 1,500.0 $ 1,000.0 $ 500.0  
Treasury stock, shares, acquired (in shares)   5,800,000   14,600,000 21,100,000 41,500,000        
Payments for repurchase of common stock | $   $ 175.7 $ 0.0 $ 329.9 $ 834.7 $ 1,340.3        
Payments for commissions | $   $ 0.8                
Stock repurchase program, remaining authorized repurchase amount | $     $ 160.5     $ 160.5        
Stock repurchased during period, shares     400,000 15,000,000.0 21,500,000          
Common Stock                    
Class of Stock [Line Items]                    
Common Stock, shares authorized (in shares)     450,000,000.0     450,000,000.0        
Common Stock, par value per share (in dollars per share) | $ / shares     $ 0.01     $ 0.01        
Preferred Stock                    
Class of Stock [Line Items]                    
Preferred Stock, shares authorized (in shares)     100,000,000.0 100,000,000.0   100,000,000.0        
Preferred Stock, par value per share (in dollars per share) | $ / shares     $ 0.01 $ 0.01   $ 0.01        
Preferred Stock, shares outstanding (in shares)     0 0   0        
Convertible Preferred Stock                    
Class of Stock [Line Items]                    
Preferred Stock, shares authorized (in shares)                   50,000,000.0
Series Common Stock                    
Class of Stock [Line Items]                    
Common Stock, shares authorized (in shares)     50,000,000.0 50,000,000.0   50,000,000.0        
Common Stock, par value per share (in dollars per share) | $ / shares     $ 0.01 $ 0.01   $ 0.01        
Common Stock, shares outstanding (in shares)     0 0   0        
Treasury Stock                    
Class of Stock [Line Items]                    
Payments for repurchase of common stock | $ $ 300.0                  
Stock repurchased during period, shares 7,200,000                  
Treasury stock acquired, average cost (in dollars per share) | $ / shares $ 41.82                  
Share repurchase discount percentage 1.70%                  
Shares relinquished, shares     400,000 400,000 400,000