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Fresh Start Accounting - Schedule of Fresh Start Accounting Adjustments (Details) - USD ($) |  | 2 Months Ended | 4 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Jun. 30, 2021 | Apr. 30, 2021 | Jun. 30, 2020 | May 01, 2021 | Dec. 31, 2020
Cash |  |  |  |  |  |
Repayments of credit facility borrowings |  | $ 0 | $ 0 | $ (15,000,000.0) |  |
Other current assets |  |  |  |  |  |
Other current assets | $ 90,500,000 | 119,700,000 | 90,500,000 |  |  | $ 386,500,000
Property & Equipment, net |  |  |  |  |  |
Property and equipment, net | 909,100,000 | 897,800,000 | 909,100,000 | 11,192,600,000 |  | 10,960,500,000
Other assets |  |  |  |  |  |
Elimination of right-of-use asset associated with Newbuild Rigs |  | 32,400,000 |  |  |  | 35,800,000
Fair value of contracts with customers | 2,200,000 | 3,100,000 | 2,200,000 |  | $ 2,200,000 | 1,800,000
Elimination of other deferred costs |  | 20,200,000 |  |  |  | 17,400,000
OTHER ASSETS | 165,300,000 | 166,500,000 | 165,300,000 |  |  | 176,200,000
Prepaid rent per rig | 8,000,000.0 |  | 8,000,000.0 |  |  |
Accrued liabilities and other |  |  |  |  |  |
Current contract liabilities (deferred revenue) |  | 35,200,000 |  |  |  | 57,600,000
Operating Lease, Liability, Current |  | 15,100,000 |  |  |  | 15,700,000
Fair value adjustment to lease liabilities | 216,500,000 |  | 216,500,000 |  |  |
Other liabilities |  |  |  |  |  |
OTHER LIABILITIES | 565,400,000 | 569,800,000 | 565,400,000 |  |  | 762,400,000
Liabilities subject to compromise |  |  |  |  |  |
LIABILITIES SUBJECT TO COMPROMISE | 0 | 0 | 0 | (7,313,700,000) |  | (7,313,700,000)
Stockholders' Equity |  |  |  |  |  |
Common shares, value | 800,000 |  | 800,000 |  |  |
Predecessor additional paid-in capital | 0 |  | 0 |  |  |
Treasury Stock, Value | 0 | $ 0 | 0 |  |  | 76,200,000
Common shares, shares issued (in shares) |  | 75,000,000 |  |  |  |
Successor additional paid-in capital | $ 1,078,700,000 | $ 1,078,700,000 | 1,078,700,000 |  |  | 8,639,900,000
Class Of Warrant, Exercisable | 5,600,000 |  |  |  |  |
Successor stock warrants | $ 16,400,000 | 16,400,000 | 16,400,000 |  |  | 0
Retained deficit |  |  |  |  |  |
Retained deficit | 0 | 6,200,000 | 0 |  |  | 4,183,800,000
Common shares, value | 800,000 |  | 800,000 |  |  |
Treasury Stock, Value | 0 | 0 | 0 |  |  | 76,200,000
Successor stock warrants | 16,400,000 | 16,400,000 | 16,400,000 |  |  | 0
Property, Plant and Equipment, Net | 909,100,000 | 897,800,000 | 909,100,000 | $ 11,192,600,000 |  | 10,960,500,000
Accrued liabilities and other |  | 212,700,000 |  |  |  | 250,400,000
Intangible Liabilities Noncurrent |  | 0 |  |  |  | 50,400,000
OTHER LIABILITIES | 565,400,000 | 569,800,000 | 565,400,000 |  |  | 762,400,000
Predecessor Class A ordinary shares |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | 0 | 0 | 0 |  |  | $ 82,500,000
Common shares, shares issued (in shares) |  |  |  |  |  | 206,100,000
Retained deficit |  |  |  |  |  |
Common shares, value | 0 | $ 0 | 0 |  |  | $ 82,500,000
Reorganization Adjustments |  |  |  |  |  |
Cash |  |  |  |  |  |
Receipt of cash for First Lien Notes | 500,000,000.0 |  |  |  |  |
Loan proceeds from backstop lenders | 20,000,000.0 |  |  |  |  |
Funds received for liquidation of rabbi trust related to certain employee benefits | 17,600,000 |  |  |  |  |
Repayments of credit facility borrowings | (129,900,000) |  |  |  |  |
Transfer of funds for payment of certain professional fees to escrow account | (42,700,000) |  |  |  |  |
Payment for certain professional services fees | (29,000,000.0) |  |  |  |  |
Other Cash | (8,600,000) |  |  |  |  |
Cash | 327,400,000 |  |  |  |  |
Other current assets |  |  |  |  |  |
Other current assets | 1,500,000 |  | 1,500,000 |  |  |
Property & Equipment, net |  |  |  |  |  |
Property and equipment, net | (417,600,000) |  | (417,600,000) |  |  |
Other assets |  |  |  |  |  |
Liquidation of rabbi trust related to certain employee benefits | (17,600,000) |  | (17,600,000) |  |  |
Elimination of right-of-use asset associated with Newbuild Rigs | (5,500,000) |  | (5,500,000) |  |  |
Fair value of options to purchase Newbuild Rigs | 13,100,000 |  | 13,100,000 |  |  |
OTHER ASSETS | (10,000,000.0) |  | (10,000,000.0) |  |  |
Other Assets | (10,000,000.0) |  | (10,000,000.0) |  |  |
Accounts Payable |  |  |  |  |  |
Professional fees incurred upon emergence | 26,100,000 |  | 26,100,000 |  |  |
Payment of professional fees incurred prior to emergence | (12,600,000) |  | (12,600,000) |  |  |
Payment of certain accounts payable incurred prior to emergence | (400,000) |  | (400,000) |  |  |
Elimination of customer payable balance | 13,100,000 |  | 13,100,000 |  |  |
Accrued liabilities and other |  |  |  |  |  |
Elimination of lease liabilities associated with Newbuild Rigs | (5,000,000.0) |  | (5,000,000.0) |  |  |
Elimination of accrued post-petition holding costs associated with Newbuild Rigs | (4,100,000) |  | (4,100,000) |  |  |
Payment of certain accrued liabilities incurred prior to emergence | (3,300,000) |  | (3,300,000) |  |  |
Elimination of customer payable balance | 13,100,000 |  | 13,100,000 |  |  |
Fair value adjustment to lease liabilities | (12,400,000) |  | (12,400,000) |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument, Face Amount | 550,000,000.0 |  | 550,000,000.0 |  |  |
Debt Issuance Costs, Net | (5,200,000) |  | (5,200,000) |  |  |
Other liabilities |  |  |  |  |  |
Elimination of construction contract intangible liabilities associated with Newbuild Rigs | (49,900,000) |  | (49,900,000) |  |  |
Elimination of accrued post-petition holding costs associated with Newbuild Rigs | (4,700,000) |  | (4,700,000) |  |  |
Elimination of lease liabilities associated with Newbuild Rigs | (600,000) |  | (600,000) |  |  |
OTHER LIABILITIES | (55,200,000) |  | (55,200,000) |  |  |
Liabilities subject to compromise |  |  |  |  |  |
LIABILITIES SUBJECT TO COMPROMISE | 7,313,700,000 |  | 7,313,700,000 |  |  |
Payment to Predecessor creditors | (129,900,000) |  |  |  |  |
Gain on settlement of liabilities subject to compromise | (6,139,000,000.0) |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | 800,000 |  | 800,000 |  |  |
Predecessor additional paid-in capital | (8,644,000,000.0) |  | (8,644,000,000.0) |  |  |
Treasury Stock, Value | $ (75,500,000) |  | $ (75,500,000) |  |  |
Common shares, shares issued (in shares) | 75,000,000 |  | 75,000,000 |  |  |
Successor additional paid-in capital | $ 1,078,700,000 |  | $ 1,078,700,000 |  |  |
Successor stock warrants | 16,400,000 |  | 16,400,000 |  |  |
Retained deficit |  |  |  |  |  |
Cash And Equity Compensation Plans | (583,600,000) |  | (583,600,000) |  |  |
Issuance of Common Shares to the Shipyard | 5,400,000 |  | 5,400,000 |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | (220,000,000.0) |  | (220,000,000.0) |  |  |
Predecessor Additional Paid In Capital, Adjustment | (7,856,400,000) |  | (7,856,400,000) |  |  |
Professional fees and success fees | 35,900,000 |  | 35,900,000 |  |  |
Backstop premium | 30,000,000.0 |  | 30,000,000.0 |  |  |
Write-off of unrecognized share-based compensation expense | 16,000,000.0 |  | 16,000,000.0 |  |  |
Impact of newbuild contract amendments | 350,700,000 |  | 350,700,000 |  |  |
Reorganization Items | (5,671,900,000) |  | (5,671,900,000) |  |  |
Retained deficit | (14,322,600,000) |  | (14,322,600,000) |  |  |
Issuance of Common Shares for backstop premium | 29,100,000 |  | 29,100,000 |  |  |
Settlement On Liabilities Subject To Compromise | 6,139,000,000.0 |  | 6,139,000,000.0 |  |  |
Common shares, value | 800,000 |  | 800,000 |  |  |
Treasury Stock, Value | (75,500,000) |  | (75,500,000) |  |  |
Successor stock warrants | 16,400,000 |  | 16,400,000 |  |  |
Property, Plant and Equipment, Net | (417,600,000) |  | (417,600,000) |  |  |
OTHER LIABILITIES | (55,200,000) |  | (55,200,000) |  |  |
Reorganization Adjustments | Predecessor Creditors And The Shipyard |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  |
Liabilities Subject To Compromise, Stock Issued | (721,000,000.0) |  |  |  |  |
Reorganization Adjustments | Backstop Parties |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  |
Liabilities Subject To Compromise, Stock Issued | (323,800,000) |  |  |  |  |
Reorganization Adjustments | Predecessor Class A ordinary shares |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | (82,500,000) |  | (82,500,000) |  |  |
Retained deficit |  |  |  |  |  |
Common shares, value | (82,500,000) |  | (82,500,000) |  |  |
Reorganization Adjustments | Common Class A And B Shares |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | (82,600,000) |  | (82,600,000) |  |  |
Retained deficit |  |  |  |  |  |
Common shares, value | (82,600,000) |  | (82,600,000) |  |  |
Reorganization Adjustments | Work-in-progress |  |  |  |  |  |
Property & Equipment, net |  |  |  |  |  |
Property and equipment, net | (417,600,000) |  | (417,600,000) |  |  |
Retained deficit |  |  |  |  |  |
Property, Plant and Equipment, Net | (417,600,000) |  | (417,600,000) |  |  |
Fresh Start Accounting Adjustments |  |  |  |  |  |
Other current assets |  |  |  |  |  |
Elimination of materials and supplies | (260,800,000) |  | (260,800,000) |  |  |
Elimination of historical deferred contract drilling expenses | (20,300,000) |  | (20,300,000) |  |  |
Other current assets | (281,100,000) |  | (281,100,000) |  |  |
Property & Equipment, net |  |  |  |  |  |
Property and equipment, net | (8,699,700,000) |  | (8,699,700,000) |  |  |
Other assets |  |  |  |  |  |
Elimination of right-of-use asset associated with Newbuild Rigs | 400,000 |  | 400,000 |  |  |
Deferred tax impacts of certain fresh start adjustments | 21,100,000 |  | 21,100,000 |  |  |
Fair value of contracts with customers | 8,500,000 |  | 8,500,000 |  |  |
Elimination of historical deferred contract drilling expenses | (16,500,000) |  | (16,500,000) |  |  |
Elimination of other deferred costs | (4,600,000) |  | (4,600,000) |  |  |
OTHER ASSETS | 8,900,000 |  | 8,900,000 |  |  |
Other Assets | (20,700,000) |  | (20,700,000) |  |  |
Accounts Payable |  |  |  |  |  |
Elimination of customer payable balance | (36,800,000) |  | (36,800,000) |  |  |
Accrued liabilities and other |  |  |  |  |  |
Elimination of customer payable balance | (36,800,000) |  | (36,800,000) |  |  |
Elimination of historical deferred revenues | (25,900,000) |  | (25,900,000) |  |  |
Current contract liabilities (deferred revenue) | 500,000 |  | 500,000 |  |  |
Operating Lease, Liability, Current | 400,000 |  | 400,000 |  |  |
Fair value adjustment to lease liabilities | (61,800,000) |  | (61,800,000) |  |  |
Other liabilities |  |  |  |  |  |
Elimination of lease liabilities associated with Newbuild Rigs | 1,100,000 |  | 1,100,000 |  |  |
Liability, Defined Benefit Plan, Noncurrent | (82,700,000) |  | (82,700,000) |  |  |
Historical Deferred Revenues, Noncurrent | (5,900,000) |  | (5,900,000) |  |  |
Deferred Tax Impacts Of Certain Fresh Start Adjustments | 1,700,000 |  | 1,700,000 |  |  |
Other Liabilities | 200,000 |  | 200,000 |  |  |
OTHER LIABILITIES | (85,600,000) |  | (85,600,000) |  |  |
Liabilities subject to compromise |  |  |  |  |  |
LIABILITIES SUBJECT TO COMPROMISE | 0 |  | 0 |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | 0 |  | 0 |  |  |
Predecessor additional paid-in capital | 0 |  | 0 |  |  |
Treasury Stock, Value | 0 |  | 0 |  |  |
Successor additional paid-in capital | 0 |  | 0 |  |  |
Successor stock warrants | 0 |  | 0 |  |  |
Retained deficit |  |  |  |  |  |
Retained deficit | 9,175,200,000 |  | 9,175,200,000 |  |  |
Common shares, value | 0 |  | 0 |  |  |
Treasury Stock, Value | 0 |  | 0 |  |  |
Successor stock warrants | 0 |  | 0 |  |  |
Prepaid Expense and Other Assets, Current | (281,100,000) |  | (281,100,000) |  |  |
Property, Plant and Equipment, Net | (8,699,700,000) |  | (8,699,700,000) |  |  |
Intangible Assets, Net (Excluding Goodwill) | 8,500,000 |  | 8,500,000 |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss | (214,400,000) |  | (214,400,000) |  |  |
Accrued liabilities and other | 62,800,000 |  | 62,800,000 |  |  |
Intangible Liabilities Noncurrent | (500,000) |  | (500,000) |  |  |
Other Sundry Liabilities, Noncurrent | 87,300,000 |  | 87,300,000 |  |  |
Equity Method Investments | (43,400,000) |  | (43,400,000) |  |  |
OTHER LIABILITIES | (85,600,000) |  | (85,600,000) |  |  |
Elimination of Predecessor accumulated other comprehensive loss | (93,400,000) |  | (93,400,000) |  |  |
Total fresh start adjustments included in reorganization items, net | (9,194,600,000) |  | (9,194,600,000) |  |  |
Tax impact of fresh start adjustments | 19,400,000 |  | 19,400,000 |  |  |
Fresh Start Accounting Adjustments | Predecessor Class A ordinary shares |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Common shares, value | 0 |  | 0 |  |  |
Retained deficit |  |  |  |  |  |
Common shares, value | $ 0 |  | $ 0 |  |  |

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