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Equity - Stock-Based Compensation (Narrative) (Details) - USD ($) | 2 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares reserved for future issuance (in shares) | 7,080,000 |  |  |  |
Allocated share-based compensation expense | $ 0 | $ 2,000,000 | $ 9,000,000 | $ 7,000,000 |
Tax benefit from compensation expense |  |  | $ 0 | $ 1,500,000 |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Unrecognized compensation costs |  |  | $ 8,000,000 |  |
Unrecognized compensation cost, weighted average period of recognition |  |  | 2 years |  |
Performance-based Restricted Stock Units (PSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs |  |  | $ 5,000,000 |  |
Unrecognized compensation cost, weighted average period of recognition |  |  | 2 years |  |
Restated Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares reserved for future issuance (in shares) |  |  |  |  | 10,000,000
Number of shares available for grant (in shares) |  |  | 6,954,454 |  |
Minimum | Performance-based Restricted Stock Units (PSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 2 years |  |
Vesting rights percentage |  |  | 0.00% |  |
Maximum | Performance-based Restricted Stock Units (PSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Vesting rights percentage |  |  | 200.00% |  |

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