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Stockholders' Equity Textuals (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 2 Months Ended | 4 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2017 | Feb. 19, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Aug. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Treasury stock, shares, acquired |  |  |  | 5.8 |  |  |
Predecessor |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Treasury Stock, shares |  |  |  |  |  |  | 0.8
Predecessor | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 53.3
Predecessor | Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  |  |  |  |  | 10.0
Preferred Stock, shares outstanding |  |  |  |  |  |  | 0.0
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 0.01
Predecessor | Series Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  | 40.0
Predecessor | Perpetual Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  |  |  |  |  | 0.8
Preferred Stock, shares outstanding |  |  |  |  |  |  | 0.0
Successor |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares outstanding |  |  | 13.5 | 13.5 |  | 30.0 |
Treasury Stock, shares |  |  | 5.8 | 5.8 |  |  |
Shares Relinquished, Shares |  |  |  | (0.1) |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 500.0 |  |
Treasury stock, shares, acquired | 1.5 |  | 4.3 |  |  |  |
Treasury stock, value, acquired | $ 40.0 |  | $ 135.7 | $ 175.7 |  |  |
Successor | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 450.0 | 450.0 |  |  |
Successor | Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  | 50.0 | 50.0 |  |  |
Preferred Stock, shares outstanding |  |  | 0.0 | 0.0 |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 | $ 0.01 |  |  |
Successor | Series Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 50.0 | 50.0 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Treasury stock, shares, acquired |  | 0.9 |  |  |  |  |
Treasury stock, value, acquired |  | $ 38.5 |  |  |  |  |

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