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Stockholders' Equity Textuals (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 33 Months Ended
Aug. 14, 2018
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Oct. 30, 2018
Jan. 01, 2018
Apr. 02, 2017
Class of Stock [Line Items]                  
Preferred Stock, shares authorized       100.0   100.0      
Common Stock, Shares, Outstanding   70.9 105.2 96.9 110.4 96.9      
Preferred Stock, shares outstanding (in shares)   30.0 13.5 0.0 0.0 0.0   13.5  
Treasury Stock, shares       42.3 27.3 42.3      
Stock Repurchase Program, Authorized Amount             $ 1,500.0    
Treasury stock, shares, acquired     5.8 14.6 21.1 41.5      
Payments for Repurchase of Common Stock   $ 0.0 $ 175.7 $ 329.9 $ 834.7 $ 1,340.3      
Treasury stock, value, acquired     $ 175.7 329.9 $ 834.7        
Payments for Commissions       0.8          
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 160.5   $ 160.5      
Stock Repurchased During Period, Shares     5.8 15.0 21.5        
Shares Relinquished, Shares         0.4        
Treasury Stock                  
Class of Stock [Line Items]                  
Payments for Repurchase of Common Stock $ 300.0                
Treasury stock, value, acquired     $ 175.7 $ 329.9 $ 834.7        
Stock Repurchased During Period, Shares 7.2                
Treasury Stock Acquired, Average Cost Per Share $ 41.82                
Share Repurchase Discount Percentage 1.70%                
Common Stock                  
Class of Stock [Line Items]                  
Common Stock, shares authorized       450.0 450.0 450.0      
Common Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01      
Common Stock, Shares, Outstanding       96.9 110.4 96.9      
Preferred Stock                  
Class of Stock [Line Items]                  
Preferred Stock, shares authorized       100.0 50.0 100.0      
Preferred Stock, shares outstanding (in shares)       0.0 0.0 0.0      
Preferred Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01      
Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Preferred Stock, shares authorized       0.0 50.0 0.0     50.0
Preferred Stock, shares outstanding (in shares)       0.0 13.5 0.0      
Preferred Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01      
Series Common Stock                  
Class of Stock [Line Items]                  
Common Stock, shares authorized       50.0 50.0 50.0      
Common Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01      
Common Stock, Shares, Outstanding       0.0 0.0 0.0