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Earnings per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Apr. 01, 2017
Sep. 30, 2017
Sep. 30, 2018
Jan. 31, 2018
Dec. 31, 2017
Successor              
EPS numerator:              
Income (loss) from continuing operations, net of income taxes $ 83.9 $ 233.7   $ 335.1 $ 412.2    
Less: Series A Convertible Preferred Stock dividends 0.0 23.5   138.6 102.5    
Less: Net income attributable to noncontrolling interests 8.3 5.1   8.9 8.9    
Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities 75.6 205.1   187.6 300.8    
Less: Earnings allocated to participating securities 0.0 51.6   50.6 5.7    
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1) [1] 75.6 153.5   137.0 295.1    
Loss from discontinued operations, net of income taxes (4.1) (3.7)   (6.4) (9.0)    
Less: Loss from discontinued operations allocated to participating securities 0.0 (0.9)   (1.7) (0.2)    
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities (4.1) (2.8)   (4.7) (8.8)    
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1) [1] $ 71.5 $ 150.7   $ 132.3 $ 286.3    
EPS denominator:              
Weighted average shares outstanding — basic 118.6 101.6   99.2 121.3    
Impact of dilutive securities 1.7 1.5   1.0 1.8    
Weighted average shares outstanding — diluted [2] 120.3 103.1   100.2 123.1    
Basic EPS attributable to common stockholders:              
Income from continuing operations, per basic share $ 0.64 $ 1.51   $ 1.38 $ 2.43    
Loss from discontinued operation, per basic share (0.04) (0.03)   (0.05) (0.07)    
Basic income per share (in dollars per share) 0.60 1.48   1.33 2.36    
Diluted EPS attributable to common stockholders:              
Income from continuing operations, per diluted share 0.63 1.49   1.37 2.40    
Loss from discontinued operations, per diluted share (0.04) (0.02)   (0.05) (0.07)    
Diluted income per share (in dollars per share) $ 0.59 $ 1.47   $ 1.32 $ 2.33    
Earnings Per Share Table Footnotes [Abstract]              
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ 0.6     $ 0.4 $ 0.1    
Weighted Average Number of Shares Outstanding, Diluted 34.2     36.7 2.8    
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017) 0.1 0.1   0.1 0.1    
Successor | Convertible Preferred Stock              
Earnings Per Share Table Footnotes [Abstract]              
Preferred stock, shares issued 0.0       0.0 30.0 30.0
Successor | Common Stock | Common Stock              
Earnings Per Share Table Footnotes [Abstract]              
Common stock, shares converted from convertible preferred stock           59.3  
Predecessor              
EPS numerator:              
Income (loss) from continuing operations, net of income taxes     $ (195.5)        
Less: Series A Convertible Preferred Stock dividends     0.0        
Less: Net income attributable to noncontrolling interests     4.8        
Income (loss) from continuing operations attributable to common stockholders, before allocation of earnings to participating securities     (200.3)        
Less: Earnings allocated to participating securities     0.0        
Income (loss) from continuing operations attributable to common stockholders, after allocation of earnings to participating securities (1) [1]     (200.3)        
Loss from discontinued operations, net of income taxes     (16.2)        
Less: Loss from discontinued operations allocated to participating securities     0.0        
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities     (16.2)        
Net income (loss) attributable to common stockholders, after allocation of earnings to participating securities (1) [1]     $ (216.5)        
EPS denominator:              
Weighted average shares outstanding — basic     18.3        
Impact of dilutive securities     0.0        
Weighted average shares outstanding — diluted [2]     18.3        
Basic EPS attributable to common stockholders:              
Income from continuing operations, per basic share     $ (10.93)        
Loss from discontinued operation, per basic share     (0.88)        
Basic income per share (in dollars per share)     (11.81)        
Diluted EPS attributable to common stockholders:              
Income from continuing operations, per diluted share     (10.93)        
Loss from discontinued operations, per diluted share     (0.88)        
Diluted income per share (in dollars per share)     $ (11.81)        
Earnings Per Share Table Footnotes [Abstract]              
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017)     0.2        
[1] There was no reallocation adjustment for participating securities to arrive at the numerator to calculate diluted EPS for the three months ended September 30, 2018, due to the conversion of all remaining shares of Preferred Stock as of January 31, 2018. The reallocation adjustment for participating securities to arrive at the numerator to calculate diluted EPS was $0.6 million, $0.1 million and $0.4 million for the three months ended September 30, 2017, the nine months ended September 30, 2018 and the period April 2 through September 30, 2017, respectively.
[2] The two-class method assumes that participating securities are not exercised or converted. As such, weighted average diluted shares outstanding excluded 34.2 million shares, 2.8 million shares and 36.7 million shares related to the participating securities for the three months ended September 30, 2017, the nine months ended September 30, 2018 and the period April 2 through September 30, 2017, respectively