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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 4 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Aug. 18, 2020 | Apr. 30, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 25, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debtor Reorganization Items, Discharge of Claims and Liabilities | $ 7,100,000,000 |  |  |  |  |  |
Amount arranged |  |  |  |  |  |  | $ 500,000,000.0
Plan Of Reorganization, Percent Of Subscription Rights | 97.60% |  |  |  |  |  |
Debtor in possession, borrowings outstanding |  |  |  |  | $ 0 |  |
Contractual interest expense |  |  | $ 32,600,000 | $ 132,900,000 |  |  |
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ 14.39 |  | $ 14.39 | $ 14.39 | $ 0.01 |  |
Class of Warrant or Right, Outstanding |  |  |  |  | 5,645,161 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 131.88 |  |
Warranted, Period Exercisable |  |  |  |  | 7 years |  |
Predecessor Class A ordinary shares |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ 0.01 |  | $ 0.01 | $ 0.01 |  | $ 0.40 |
Management Incentive Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 8,960,573 |  | 8,960,573 | 8,960,573 |  |  |
Senior Noteholders |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 38.48% |  |  |  |  |
Plan Of Reorganization, Securities Issued | 28,859,900 |  |  |  |  |  |
Senior Noteholders Participating In Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 29.30% |  |  |  |  |
Plan Of Reorganization, Securities Issued | 21,975,000 |  |  |  |  |  |
Senior Noteholder Who Agreed To Backstop The Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 2.63% |  |  |  |  |
Amount arranged | $ 48,800,000 |  | $ 48,800,000 | $ 48,800,000 |  |  |
Plan Of Reorganization, Securities Issued | 1,975,500 |  |  |  |  |  |
Lenders under Revolving Credit Facility Participating in Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 0.70% |  |  |  |  |
Plan Of Reorganization, Securities Issued | 525,000 |  |  |  |  |  |
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 0.07% |  |  |  |  |
Amount arranged | $ 1,200,000 |  | 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] |  |  |  |  |  |  |
Pro rata share |  | 5.30% |  |  |  |  |
Amount arranged | $ 7,800,000 |  | 7,800,000 | 7,800,000 |  |  |
Plan Of Reorganization, Securities Issued | 4,005,000 |  |  |  |  |  |
Daewoo Shipbuilding & Marine Engineering Co., Ltd. |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Amount arranged | $ 5,000,000.0 |  | 5,000,000.0 | 5,000,000.0 |  |  |
Plan Of Reorganization, Securities Issued | 375,000 |  |  |  |  |  |
Lenders Under Revolving Credit Facility Not Participating in Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 22.98% |  |  |  |  |
Amount arranged | $ 96,100,000 |  | 96,100,000 | 96,100,000 |  |  |
Plan Of Reorganization, Securities Issued | 17,235,000 |  |  |  |  |  |
First Lien Notes | Two RCF Lendors Participating In The Rights Offering |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pro rata share |  | 2.427% |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Cash payment |  | $ 26,000,000.0 |  |  |  |  |
Senior Notes | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 6.875% |  |  |  |  |
Senior Notes | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 7.875% |  |  |  |  |
Senior Notes | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 4.875% |  |  |  |  |
Senior Notes | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 4.75% |  |  |  |  |
Senior Notes | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 7.375% |  |  |  |  |
Senior Notes | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 5.40% |  |  |  |  |
Senior Notes | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 5.85% |  |  |  |  |
Senior Notes | First Lien Notes |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 550,000,000.0 |  | 550,000,000.0 | 550,000,000.0 |  |  |
Amount arranged | $ 520,000,000 |  | $ 520,000,000 | $ 520,000,000 |  |  |
Senior Notes | Seven Point Two Zero Debenture Due Twenty Twenty Seven |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings outstanding |  | 7.20% |  |  |  |  |

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