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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Stockholders' Equity Attributable to Parent [Abstract] |  |
Summary Of Common Stock Activity [Table Text Block] | The following table summarizes Common Stock activity during the periods presented below:
| Year Ended December 31, 2019 |  | Year Ended December 31, 2018 |  | April 2 through December 31, 2017
| (In millions)
Shares outstanding at the beginning of the period | 110.4 |  |  | 105.2 |  |  | 70.9 |
Shares issued for preferred share conversions | — |  |  | 25.5 |  |  | 33.8 |
Shares issued for warrant conversions | — |  |  | — |  |  | 6.2 |
Shares issued for vested restricted stock units | 1.5 |  |  | 1.1 |  |  | 0.1 |
Shares issued for disputed claims | — |  |  | 0.1 |  |  | — |
Shares repurchased | (15.0 | ) |  | (21.5 | ) |  | (5.8 | )
Shares outstanding at the end of the period | 96.9 |  |  | 110.4 |  |  | 105.2 |
Summary of Preferred Stock Activity [Table Text Block] |  | The following table summarizes the Series A Convertible Preferred Stock activity during the periods presented below:
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017
| (In millions)
Shares outstanding at the beginning of the period | 13.5 |  |  | 30.0 |
Shares converted to Common Stock | (13.5 | ) |  | (17.2 | )
Shares issued for payable in-kind preferred stock dividends | — |  |  | 0.7 |
Shares outstanding at the end of the period | — |  |  | 13.5 |

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