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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 |

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