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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Apr. 01, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Jan. 31, 2018
Successor                            
EPS numerator:                            
Income (loss) from continuing operations, net of income taxes   $ 233.5 $ 83.9 $ 120.0 $ 208.3 $ 378.0 $ 233.7 $ 101.4     $ 713.1 $ 645.7    
Less: Series A Convertible Preferred Stock dividends                     179.5 102.5    
Less: Net income attributable to noncontrolling interests                     15.2 16.9    
Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities                     518.4 526.3    
Less: Earnings allocated to participating securities                     129.0 7.9    
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1)                     389.4 518.4    
Income (loss) from discontinued operations, net of income taxes                     (19.8) 18.1    
Less: Income (loss) from discontinued operations allocated to participating securities                     (4.9) 0.3    
Income (loss) from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities                     (14.9) 17.8    
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1)                     $ 374.5 $ 536.2    
EPS denominator:                            
Weighted average shares outstanding — basic   113.1 118.6 124.5 120.9 104.8 101.6 96.8     101.1 119.3    
Impact of dilutive securities                     1.4 1.7    
Weighted average shares outstanding — diluted (2)                     102.5 121.0    
Basic EPS attributable to common stockholders:                            
Basic income (loss) per share   $ 1.99 $ 0.64 $ 0.94 $ 0.84 $ 2.50 $ 1.51 $ (0.18)     $ 3.85 $ 4.35    
Income (loss) from discontinued operations                     (0.15) 0.15    
Net income (loss) attributable to common stockholders                     3.70 4.50    
Diluted EPS attributable to common stockholders:                            
Diluted income (loss) per share   $ 1.97 $ 0.63 $ 0.93 $ 0.83 $ 2.47 $ 1.49 $ (0.18)     3.81 4.28    
Income (loss) from discontinued operations                     (0.14) 0.15    
Net income (loss) attributable to common stockholders                     $ 3.67 $ 4.43    
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted                     $ 1.2 $ 0.1    
Weighted average shares outstanding — diluted   114.7 120.3 126.0 123.2 106.5 103.1 96.8     33.5 2.1    
Earnings per Share (EPS) (Textuals) [Abstract]                            
Antidilutive shares excluded from EPS calculation                       0.1    
Successor | Effect of Plan                            
Earnings per Share (EPS) (Textuals) [Abstract]                            
Convertible preferred stock, shares issued upon conversion 46.2               46.2          
Successor | Convertible Preferred Stock                            
Earnings per Share (EPS) (Textuals) [Abstract]                            
Preferred Stock, shares issued (in shares)   0.0       30.0         30.0 0.0   30.0
Successor | Common Stock | Common Stock                            
Earnings per Share (EPS) (Textuals) [Abstract]                            
Convertible preferred stock, shares issued upon conversion                           59.3
Predecessor                            
EPS numerator:                            
Income (loss) from continuing operations, net of income taxes $ (319.8)               $ (195.5) $ 124.3     $ (663.8)  
Less: Series A Convertible Preferred Stock dividends                 0.0       0.0  
Less: Net income attributable to noncontrolling interests                 4.8       7.9  
Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities                 (200.3)       (671.7)  
Less: Earnings allocated to participating securities                 0.0       0.0  
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1)                 (200.3)       (671.7)  
Income (loss) from discontinued operations, net of income taxes                 (16.2)       (57.6)  
Less: Income (loss) from discontinued operations allocated to participating securities                 0.0       0.0  
Income (loss) from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities                 (16.2)       (57.6)  
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1)                 $ (216.5)       $ (729.3)  
EPS denominator:                            
Weighted average shares outstanding — basic 18.3               18.3 18.3     18.3  
Impact of dilutive securities                 0.0       0.0  
Weighted average shares outstanding — diluted (2)                 18.3       18.3  
Basic EPS attributable to common stockholders:                            
Basic income (loss) per share $ (17.44)               $ (10.93) $ 6.46     $ (36.72)  
Income (loss) from discontinued operations                 (0.88)       (3.15)  
Net income (loss) attributable to common stockholders                 (11.81)       (39.87)  
Diluted EPS attributable to common stockholders:                            
Diluted income (loss) per share $ (17.44)               (10.93) $ 6.44     (36.72)  
Income (loss) from discontinued operations                 (0.88)       (3.15)  
Net income (loss) attributable to common stockholders                 $ (11.81)       $ (39.87)  
Weighted average shares outstanding — diluted 18.3                 18.4        
Earnings per Share (EPS) (Textuals) [Abstract]                            
Antidilutive shares excluded from EPS calculation                 0.2       0.4