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Issuance of Equity Securities (Details) $ / shares in Units, $ in Millions |  | 2 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) days $ / shares shares | Feb. 15, 2019 shares | Dec. 31, 2017 shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares | Dec. 31, 2018 shares | Jan. 31, 2018 shares | Jul. 03, 2017
Warrant | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Number of securities called by each right | 1 |  |  |  |  |  |  |
Exercise price | $ / shares | $ 0.01 |  |  |  |  |  |  |
Warrants issued (in shares) | 6,200,000 |  |  |  |  |  |  |
Warrants unexercised, percent |  |  |  |  |  |  |  | 0.10%
Series A Preferred Stock | Preferred Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 8.50% |  |  |  |  |  |  |
Preferred stock, conversion price (in dollars per share) | $ / shares | $ 16.25 |  |  |  |  |  |  |
Discount percent of common stock value | 35.00% |  |  |  |  |  |  |
Threshold price of common stock | $ / shares | $ 32.50 |  |  |  |  |  |  |
Threshold trading days | days | 45 |  |  |  |  |  |  |
Threshold consecutive trading days | days | 60 |  |  |  |  |  |  |
Threshold last trading days in consecutive trading period | days | 20 |  |  |  |  |  |  |
Conversion period threshold after initial issuance | 3 years |  |  |  |  |  |  |
Section 1145 Securities | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Stock issued | $ | $ 704.4 |  |  |  |  |  |  |
Section 1145 Securities | Common Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 51,200,000 |  |  |  |  |  |  |
Section 1145 Securities | Warrant | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 2,900,000 |  |  |  |  |  |  |
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 4,800,000 |  |  |  |  |  |  |
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 3,100,000 |  |  |  |  |  |  |
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Preferred Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Stock issued | $ | $ 750.0 |  |  |  |  |  |  |
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Series A Preferred Stock | Preferred Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 30,000,000 |  |  |  |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Stock issued | $ | $ 45.6 |  |  |  |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 3,300,000 |  |  |  |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 200,000 |  |  |  |  |  |  |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Rights Offering | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Units authorized | 54,500,000.0 |  |  |  |  |  |  |
Number of securities called by each right | 1 |  |  |  |  |  |  |
Exercise price | $ / shares | $ 13.75 |  |  |  |  |  |  |
Rights offering, units purchased | 51,200,000 |  |  |  |  |  |  |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Section 1145 Securities | Common Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
New shares issued (in shares) | 11,600,000 |  |  |  |  |  |  |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Parties to Backstop Commitment Agreement | Rights Offering | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Rights offering, units purchased | 3,300,000 |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares, acquired |  | 2,300,000 |  |  |  |  |  |
Successor |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares, acquired |  |  |  | 21,100,000 | 5,800,000 | 26,900,000 |  |
Conversion of Stock, Shares Converted |  |  | (17,200,000) | (13,500,000) |  |  |  |
Successor | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Common stock, outstanding (in shares) | 70,900,000 |  |  |  |  |  |  |
Discount percent of common stock value | 35.00% |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion | 46,200,000 |  |  |  |  |  |  |
Successor | Common Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Stock issued | $ | $ 70.9 |  |  |  |  |  |  |
Successor | Series A Preferred Stock | Effect of Plan |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, shares issued (in shares) | 30,000,000.0 |  |  |  |  |  |  |
Successor | Convertible Preferred Stock |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  |  | 30,000,000 | 0 | 30,000,000 | 0 | 30,000,000 |
Successor | Common Stock |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  | 111,800,000 | 137,700,000 | 111,800,000 | 137,700,000 |  |
Successor | Common Stock | Common Stock |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  |  |  |  | 59,300,000 |

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