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Stockholders' Equity Textuals (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 14, 2018 | Feb. 15, 2019 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Oct. 30, 2018 | Apr. 25, 2018 | Aug. 01, 2017 | Apr. 02, 2017
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, acquired |  | 2.3 |  |  |  |  |  |  |  |  |  |
Treasury stock, value, acquired |  | $ 75.0 |  |  |  |  |  |  |  |  |  |
Successor |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  |  |  | 100.0 |  |  | 100.0 |  |  |  |
Preferred Stock, shares outstanding (in shares) |  |  | 30.0 | 13.5 | 0.0 | 13.5 |  | 0.0 |  |  |  |
Treasury Stock, shares |  |  |  | 5.8 | 27.3 | 5.8 |  | 27.3 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 1,500.0 | $ 1,000.0 | $ 500.0 |
Treasury stock, shares, acquired |  |  |  |  | 21.1 | 5.8 |  | 26.9 |  |  |  |
Payments for Repurchase of Common Stock |  |  |  | $ 175.7 | $ 834.7 |  |  | $ 1,010.4 |  |  |  |
Treasury stock, value, acquired |  |  |  | 175.7 | 834.7 |  |  |  |  |  |  |
Payments for Commissions |  |  |  | $ 0.5 |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  | $ 490.1 |  |  | $ 490.1 |  |  |  |
Stock Repurchased During Period, Shares |  |  |  | 5.8 | 21.1 |  |  |  |  |  |  |
Shares Relinquished, Shares |  |  |  |  | 0.4 |  |  |  |  |  |  |
Successor | Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | $ 300.0 |  |  |  |  |  |  |  |  |  |  |
Treasury stock, value, acquired |  |  |  | $ 175.7 | $ 834.7 |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 7.2 |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 41.82 |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Discount Percentage | 1.70% |  |  |  |  |  |  |  |  |  |  |
Successor | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized |  |  |  | 450.0 | 450.0 | 450.0 |  | 450.0 |  |  |  |
Common Stock, par value per share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |
Successor | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  |  | 50.0 | 100.0 | 50.0 |  | 100.0 |  |  |  |
Preferred Stock, shares outstanding (in shares) |  |  |  | 0.0 | 0.0 | 0.0 |  | 0.0 |  |  |  |
Preferred Stock, par value per share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |
Successor | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, shares authorized |  |  |  | 50.0 | 0.0 | 50.0 |  | 0.0 |  |  |  | 50.0
Preferred Stock, shares outstanding (in shares) |  |  |  | 13.5 | 0.0 | 13.5 |  | 0.0 |  |  |  |
Preferred Stock, par value per share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |
Successor | Series Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized |  |  |  | 50.0 | 50.0 | 50.0 |  | 50.0 |  |  |  |
Common Stock, par value per share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 0.0 |  |  |  | $ 0.0 |  |  |  |  |

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