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Stockholders' Equity Textuals (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Aug. 14, 2018
Feb. 15, 2019
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Oct. 30, 2018
Apr. 25, 2018
Aug. 01, 2017
Apr. 02, 2017
Subsequent Event                        
Class of Stock [Line Items]                        
Treasury stock, shares, acquired   2.3                    
Treasury stock, value, acquired   $ 75.0                    
Successor                        
Class of Stock [Line Items]                        
Preferred Stock, shares authorized         100.0     100.0        
Preferred Stock, shares outstanding (in shares)     30.0 13.5 0.0 13.5   0.0        
Treasury Stock, shares       5.8 27.3 5.8   27.3        
Stock Repurchase Program, Authorized Amount                 $ 1,500.0 $ 1,000.0 $ 500.0  
Treasury stock, shares, acquired         21.1 5.8   26.9        
Payments for Repurchase of Common Stock       $ 175.7 $ 834.7     $ 1,010.4        
Treasury stock, value, acquired       175.7 834.7              
Payments for Commissions       $ 0.5                
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 490.1     $ 490.1        
Stock Repurchased During Period, Shares       5.8 21.1              
Shares Relinquished, Shares         0.4              
Successor | Treasury Stock                        
Class of Stock [Line Items]                        
Payments for Repurchase of Common Stock $ 300.0                      
Treasury stock, value, acquired       $ 175.7 $ 834.7              
Stock Repurchased During Period, Shares 7.2                      
Treasury Stock Acquired, Average Cost Per Share $ 41.82                      
Share Repurchase Discount Percentage 1.70%                      
Successor | Common Stock                        
Class of Stock [Line Items]                        
Common Stock, shares authorized       450.0 450.0 450.0   450.0        
Common Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01   $ 0.01        
Successor | Preferred Stock                        
Class of Stock [Line Items]                        
Preferred Stock, shares authorized       50.0 100.0 50.0   100.0        
Preferred Stock, shares outstanding (in shares)       0.0 0.0 0.0   0.0        
Preferred Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01   $ 0.01        
Successor | Convertible Preferred Stock                        
Class of Stock [Line Items]                        
Preferred Stock, shares authorized       50.0 0.0 50.0   0.0       50.0
Preferred Stock, shares outstanding (in shares)       13.5 0.0 13.5   0.0        
Preferred Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01   $ 0.01        
Successor | Series Common Stock                        
Class of Stock [Line Items]                        
Common Stock, shares authorized       50.0 50.0 50.0   50.0        
Common Stock, par value per share (in dollars per share)       $ 0.01 $ 0.01 $ 0.01   $ 0.01        
Predecessor                        
Class of Stock [Line Items]                        
Payments for Repurchase of Common Stock     $ 0.0       $ 0.0