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Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
EPS numerator: |  |  |  |  |  |
Income (loss) from continuing operations, net of income taxes |  |  |  | $ (223.2) |  | $ (390.9)
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Loss from continuing operations (in dollars per share) |  |  |  | $ (12.30) |  | $ (21.47)
Net loss attributable to common stockholders (in dollars per share) |  |  |  | $ (12.46) |  | $ (21.82)
Successor |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017) |  | 0.1 |  |  |  |
EPS numerator: |  |  |  |  |  |
Income (loss) from continuing operations, net of income taxes |  | $ 101.4 |  |  |  |
Less: Series A Convertible Preferred Stock dividends |  | 115.1 |  |  |  |
Less: Net income attributable to noncontrolling interests |  | 3.8 |  |  |  |
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities |  | (17.5) |  |  |  |
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities |  | (2.7) |  |  |  |
Net loss attributable to common stockholders, after allocation of earnings to participating securities |  | $ (20.2) |  |  |  |
EPS denominator: |  |  |  |  |  |
Weighted average shares outstanding — basic and diluted (in shares) |  | 96.8 |  |  |  |
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Loss from continuing operations (in dollars per share) |  | $ (0.18) |  |  |  |
Loss from discontinued operations (in dollars per share) |  | (0.03) |  |  |  |
Net loss attributable to common stockholders (in dollars per share) |  | $ (0.21) |  |  |  |
Predecessor |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive shares excluded from EPS calculation (less than 0.1 million for the period April 2 through June 30, 2017) | 0.2 |  | 0.2 | 0.4 |  | 0.4
EPS numerator: |  |  |  |  |  |
Income (loss) from continuing operations, net of income taxes | $ (319.8) |  | $ (195.5) | $ (223.2) |  | $ (390.9)
Less: Series A Convertible Preferred Stock dividends | 0.0 |  | 0.0 | 0.0 |  | 0.0
Less: Net income attributable to noncontrolling interests | 0.0 |  | 4.8 | 1.7 |  | 1.7
Loss from continuing operations attributable to common stockholders, after allocation of earnings to participating securities | (319.8) |  | (200.3) | (224.9) |  | (392.6)
Loss from discontinued operations attributable to common stockholders, after allocation of earnings to participating securities | (12.1) |  | (16.2) | (3.0) |  | (6.4)
Net loss attributable to common stockholders, after allocation of earnings to participating securities | $ (331.9) |  | $ (216.5) | $ (227.9) |  | $ (399.0)
EPS denominator: |  |  |  |  |  |
Weighted average shares outstanding — basic and diluted (in shares) | 18.3 |  | 18.3 | 18.3 |  | 18.3
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Loss from continuing operations (in dollars per share) | $ (17.44) |  | $ (10.93) | $ (12.30) |  | $ (21.47)
Loss from discontinued operations (in dollars per share) | (0.66) |  | (0.88) | (0.16) |  | (0.35)
Net loss attributable to common stockholders (in dollars per share) | $ (18.10) |  | $ (11.81) | $ (12.46) |  | $ (21.82)
Preferred Stock |  |  |  |  |  |
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Conversion of stock, shares converted |  |  |  |  | 11.7 |
Warrant |  |  |  |  |  |
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Warrants unexercised, percent (less than 0.1%) |  | 0.10% |  |  | 0.10% |
Common Stock |  |  |  |  |  |
Basic and diluted EPS attributable to common stockholders: |  |  |  |  |  |
Conversion of stock, shares issued |  |  |  |  | 29.2 |

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