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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($) |  | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2021 | Sep. 25, 2020 | Aug. 18, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged |  |  |  |  |  | $ 500,000,000 |
Contractual interest expense |  | $ 132,900,000 |  | $ 140,700,000 |  |  |
Plan Of Reorganization, Legal And Other Professional Advisor Fees |  |  |  | $ 64,700,000 |  |  |
Debtor Reorganization Items, Discharge of Claims and Liabilities | $ 7,100,000,000 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 14.39 | $ 14.39 | $ 0.01 |  | $ 0.01 |  |
Plan Of Reorganization, Percent Of Subscription Rights | 97.60% |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 5,600,000 | 5,600,000 | 5,470,970 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 131.88 | $ 131.88 |  |  |  |  |
Warranted, Period Exercisable |  |  | 7 years |  |  |  |
Debtor-in-Possession Financing, Borrowings Outstanding |  |  | $ 0 |  |  |  |
Management Incentive Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 9,000,000 | 9,000,000 |  |  |  |  |
Senior Noteholders [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 38.48% |  |  |  |  |  |
Plan Of Reorganization, Securities Issued | 28,900,000 |  |  |  |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 0.70% |  |  |  |  |  |
Plan Of Reorganization, Securities Issued | 500,000 |  |  |  |  |  |
Lenders Under Revolving Credit Facility Not Participating in Rights Offering [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 22.98% |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 96,100,000 | $ 96,100,000 |  |  |  |  |
Plan Of Reorganization, Securities Issued | 17,200,000 |  |  |  |  |  |
Senior Noteholders Who Agreed To Backstop The Rights Offering [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 2.63% |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 48,800,000 | 48,800,000 |  |  |  |  |
Plan Of Reorganization, Securities Issued | 2,000,000 |  |  |  |  |  |
Senior Noteholders Participating In Rights Offering [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 29.30% |  |  |  |  |  |
Plan Of Reorganization, Securities Issued | 22,000,000 |  |  |  |  |  |
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 0.07% |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 1,200,000 | 1,200,000 |  |  |  |  |
Plan Of Reorganization, Securities Issued | 49,500 |  |  |  |  |  |
Two RCF Lendors Participating In The Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 5.30% |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 7,800,000 | 7,800,000 |  |  |  |  |
Plan Of Reorganization, Securities Issued | 4,000,000 |  |  |  |  |  |
Daewoo Shipbuilding & Marine Engineering Co., Ltd. |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 5,000,000 | $ 5,000,000 |  |  |  |  |
Plan Of Reorganization, Securities Issued | 400,000 |  |  |  |  |  |
First Lien Notes | Two RCF Lendors Participating In The Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Plan Of Reorganization, Pro Rata Share Percentage | 2.427% |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Cash Payment | $ 26,000,000 |  |  |  |  |  |
Senior Notes [Member] | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 6.875% | 6.875% |  |  |  |  |
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 7.875% | 7.875% |  |  |  |  |
Senior Notes [Member] | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 7.20% | 7.20% |  |  |  |  |
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 4.875% | 4.875% |  |  |  |  | 4.875%
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 4.75% | 4.75% |  |  |  |  | 4.75%
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 7.375% | 7.375% |  |  |  |  | 7.375%
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 5.40% | 5.40% |  |  |  |  | 5.40%
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 5.85% | 5.85% |  |  |  |  | 5.85%
Senior Notes [Member] | First Lien Notes |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Amount Arranged | $ 520,000,000 | $ 520,000,000 |  |  |  |  |
Debt Instrument, Face Amount | $ 550,000,000 | $ 550,000,000 |  |  |  |  |
Senior Notes [Member] | Seven Point Two Zero Debenture Due Twenty Twenty Seven |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding | 7.20% | 7.20% |  |  |  |  |

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