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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Successor [Member]        
Income Per Share Calculation [Line Items]        
Net income (loss) $ (55.1)   $ (85.6)  
Interest expense on convertible notes 4.8   14.6  
Net income (loss), if converted - diluted $ (55.1)   $ (85.6)  
Weighted average common shares 9.1   9.0  
Denominator for basic calculation 9.1   9.0  
Weighted Average Number of Shares Outstanding, Basic and Diluted 9.1   9.0  
Net income (loss) per share - basic $ (6.05)   $ (9.51)  
Net income (loss) per share - diluted $ (6.05)   $ (9.51)  
Predecessor [Member]        
Income Per Share Calculation [Line Items]        
Net income (loss)   $ 418.9   $ 340.1
Interest expense on convertible notes   4.7   14.0
Net income (loss), if converted - diluted   $ 421.9   $ 349.1
Weighted average common shares   5.0   5.0
Less: Weighted average unvested restricted stock   0.1   0.1
Denominator for basic calculation   4.9   4.9
Convertible notes   1.8   1.8
Convertible preferred stock - equivalent common shares   35.8   27.2
Convertible preferred stock - less: share issuance limitation   34.9   26.3
Convertible preferred stock - net allowable shares   0.9   0.9
Subtotal   2.7   2.7
Less: shares excluded in a period of net loss or antidilution   0.0   0.0
Weighted average effect of dilutive securities   2.7   2.7
Weighted Average Number of Shares Outstanding, Basic and Diluted   7.6   7.6
Net income (loss) per share - basic   $ 85.49   $ 69.41
Net income (loss) per share - diluted   $ 55.51   $ 45.93
Convertible Debt [Member]        
Income Per Share Calculation [Line Items]        
Interest expense on convertible notes   $ 3.0   $ 9.0