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Fresh Start Accounting - Schedule of Fresh Start Accounting Adjustments (Details) - USD ($)		4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 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	90,500,000	117,000,000.0			$ 386,500,000
Property & Equipment, net
Property and equipment, net	909,100,000	909,100,000	892,300,000	11,082,400,000		10,960,500,000
Other assets
Elimination of right-of-use asset associated with Newbuild Rigs			23,900,000			35,800,000
Fair value of contracts with customers	2,200,000	2,200,000	1,500,000		$ 2,200,000	1,800,000
Elimination of other deferred costs			17,300,000			17,400,000
OTHER ASSETS	165,300,000	165,300,000	153,500,000			176,200,000
Prepaid rent per rig	8,000,000	8,000,000
Accrued liabilities and other
Current contract liabilities (deferred revenue)			32,500,000			57,600,000
Operating Lease, Liability, Current			11,600,000			15,700,000
Fair value adjustment to lease liabilities	216,500,000	216,500,000
Other liabilities
OTHER LIABILITIES	565,400,000	565,400,000	591,300,000			762,400,000
Liabilities subject to compromise
LIABILITIES SUBJECT TO COMPROMISE	0	0	0			(7,313,700,000)
Stockholders' Equity
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	$ 1,080,300,000			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	0	60,700,000			4,183,800,000
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	909,100,000	892,300,000	$ 11,082,400,000		10,960,500,000
Accrued liabilities and other			223,800,000			250,400,000
Intangible Liabilities Noncurrent			0			50,400,000
OTHER LIABILITIES	565,400,000	565,400,000	591,300,000			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	550,000,000
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)
Stockholders' Equity
Common shares, value	800,000	800,000
Predecessor additional paid-in capital	(8,644,000,000)	(8,644,000,000)
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
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	6,139,000,000
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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