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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Aug. 23, 2017
Apr. 01, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Apr. 01, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 03, 2017
Earnings per Share (EPS) (Textuals) [Abstract]                                
Antidilutive shares excluded from EPS calculation                             0.6  
Diluted EPS attributable to common stockholders:                                
Treasury stock, shares, acquired                         5.8      
Successor                                
Earnings per Share (EPS) (Textuals) [Abstract]                                
Antidilutive shares excluded from EPS calculation                         0.1      
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted                         $ 1.2      
EPS numerator:                                
Income (loss) from continuing operations, net of income taxes     $ 378.0 $ 233.7 $ 101.4               713.1      
Preferred Stock Dividends, Income Statement Impact                         179.5      
Less: Net income attributable to noncontrolling interests                         15.2      
Loss from continuing operations attributable to common stockholders, before allocation of earnings to participating securities                         518.4      
Less: Earnings allocated to participating securities                         129.0      
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities                         389.4      
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest                         (19.8)      
Loss from discontinued operations allocated to participating securities                         (4.9)      
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic                         (14.9)      
Net loss attributable to common stockholders, after earnings allocated to participating securities                         $ 374.5      
EPS denominator:                                
Weighted average shares outstanding, basic     104.8 101.6 96.8               101.1      
Weighted average number of shares outstanding, basic and diluted                         102.5      
Weighted average number diluted shares outstanding adjustment                         1.4      
Weighted average shares outstanding, diluted     106.5 103.1 96.8               33.5      
Basic EPS attributable to common stockholders:                                
Income (loss) from continuing operations, per basic share     $ 2.50 [1] $ 1.51 [1] $ (0.18) [1]               $ 3.85      
Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share                         (0.15)      
Net income (loss) attributable to common stockholders, per basic share                         3.70      
Diluted EPS attributable to common stockholders:                                
Income (loss) from continuing operations, per diluted share     $ 2.47 [1] $ 1.49 [1] $ (0.18) [1]               3.81      
Income (loss) from discontinued operations, net of tax, per diluted share                         (0.14)      
Net income (loss) attributable to common stockholders, per diluted share                         $ 3.67      
Conversion of Stock, Shares Converted                         (17.2)      
Conversion of Stock, Shares Issued                         6.2      
Treasury stock, shares, acquired 1.5                     4.3        
Predecessor                                
Earnings per Share (EPS) (Textuals) [Abstract]                                
Antidilutive shares excluded from EPS calculation           0.2               0.4 0.6  
EPS numerator:                                
Income (loss) from continuing operations, net of income taxes   $ (319.8)       $ (195.5) $ 124.3 $ (175.2) $ (97.7) $ (223.2) $ (167.7)     $ (663.8) $ (1,783.2)  
Preferred Stock Dividends, Income Statement Impact           0.0               0.0 0.0  
Less: Net income attributable to noncontrolling interests           4.8               7.9 7.1  
Loss from continuing operations attributable to common stockholders, before allocation of earnings to participating securities           (200.3)               (671.7) (1,790.3)  
Less: Earnings allocated to participating securities           0.0               0.0 0.0  
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities           (200.3)               (671.7) (1,790.3)  
Income (Loss) from discontinued operations, net of tax, including portion attributable to noncontrolling interest           (16.2)   $ 13.1 $ 38.1         (57.6) (175.0)  
Loss from discontinued operations allocated to participating securities           0.0               0.0 0.0  
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic           (16.2)               (57.6) (175.0)  
Net loss attributable to common stockholders, after earnings allocated to participating securities           $ (216.5)               $ (729.3) $ (1,965.3)  
EPS denominator:                                
Weighted average shares outstanding, basic   18.3       18.3 18.3 18.3 18.3 18.3 18.3     18.3 18.1  
Weighted average number of shares outstanding, basic and diluted           18.3               18.3 18.1  
Weighted average number diluted shares outstanding adjustment           0.0               0.0 0.0  
Weighted average shares outstanding, diluted   18.3         18.4                  
Basic EPS attributable to common stockholders:                                
Income (loss) from continuing operations, per basic share   $ (17.44) [1]       $ (10.93) $ 6.46 [1] $ (9.82) [2] $ (5.44) [2] $ (12.30) [2] $ (9.17) [2]     $ (36.72) $ (98.65)  
Income (Loss) from Continuing Operations, Per Basic and Diluted Share           (10.93)               (36.72) (98.65)  
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share           (0.88)               (3.15) (9.64)  
Net income (loss) attributable to common stockholders, per basic share           (11.81)               (39.87) (108.29)  
Diluted EPS attributable to common stockholders:                                
Income (loss) from continuing operations, per diluted share   $ (17.44) [1]       (10.93) $ 6.44 [1]             (36.72) (98.65)  
Income (loss) from discontinued operations, net of tax, per diluted share           (0.88)               (3.15) (9.64)  
Net income (loss) attributable to common stockholders, per diluted share           $ (11.81)               $ (39.87) $ (108.29)  
Common Stock | Successor                                
Diluted EPS attributable to common stockholders:                                
Conversion of Stock, Shares Issued                         40.0      
Warrant | Successor                                
Diluted EPS attributable to common stockholders:                                
Warrants unexercised, percent     0.00%                 0.00% 0.00%      
Preferred Stock                                
Diluted EPS attributable to common stockholders:                                
Conversion of Stock, Shares Converted                         17.2      
Effect of Plan                                
Diluted EPS attributable to common stockholders:                                
Common stock, shares issued (in shares)     130.7                 130.7 130.7      
Effect of Plan | Successor                                
Diluted EPS attributable to common stockholders:                                
Common stock, shares issued (in shares)   70.9       70.9                    
Effect of Plan | Warrant                                
Diluted EPS attributable to common stockholders:                                
Warrants unexercised, percent                               0.10%
[1] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis.
[2] EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis