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Income Taxes (Narrative) (Details) $ in Thousands, € in Millions, $ in Millions	3 Months Ended				4 Months Ended	8 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 AUD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 AUD ($)	Aug. 18, 2020	Apr. 11, 2019 USD ($)	Apr. 11, 2019 EUR (€)
Investments, Owned, Federal Income Tax Note [Line Items]
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)											$ 13,800
Income from continuing operations before income taxes in the U.S. countries					$ 373,100	$ 253,400			$ (51,000)		39,000
Income from continuing operations before income taxes in the non-U.S. countries					4,800,000	245,200			5,100,000		(102,800)
Deferred tax assets related to U.S. foreign tax credits						105,700	$ 105,700		171,200
Deferred tax assets related to net operating loss carryforwards						2,293,500	2,293,500		2,272,200
Net operating loss carryforwards						10,000,000	10,000,000
Operating Loss Carryforwards, Limitations on Use						74,800	74,800
Operating loss carryforwards, Not subject to expiration						9,100,000	9,100,000
Operating loss carryforwards, Subject to expiration						807,500	807,500
Valuation allowance on NOL carryforwards and FTC						3,800,000	3,800,000
Income Tax Expense (Benefit), Discrete Item					2,200	15,300			$ 322,400		2,300
Effective Income Tax Rate Reconciliation, Debt and Settlement Proceeds											28,300
Other discrete income tax expenses											$ 26,000
Consilidated effective income tax rate excluding discrete items									(7.60%)	(7.60%)	(14.60%)	(14.60%)	(14.60%)
Total unrecognized tax benefits					235,400	234,300	234,300		$ 237,700		$ 296,700
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized						208,900	208,900
Amount of accrued interest and penalties included in other liabilities						108,000	108,000		73,100
Amount of interest and penalties recognized in net tax expense					13,500	21,300			13,800		5,700
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations					200	17,900	17,900		4,300		5,300
Decline in unrecognized tax benefits during next twelve months						4,000	4,000
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits						1,400	1,400
Aggregate Undistributed Earnings of Subsidiaries to be Continually Reinvested						279,500	279,500
Deferred Tax Assets, Gross						3,911,900	3,911,900		2,868,700
Unrecognized Tax Benefits, Period Increase (Decrease)									122,100
Deferred Tax Assets, Net of Valuation Allowance						82,900	82,900		81,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions					0	4,500			89,300
Effective Income Tax Rate Reconciliation, Switzerland Tax Reform, Amount						15,400
Income Tax Examination, Increase (Decrease) in Liability from Prior Year						30,700	30,700
Income Tax Benefit, Fresh Start Accounting Adjustments					19,300
Change In Liabilities For Unrecognized Tax Benefits					$ 21,500
Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] | Senior Notes [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding														4.875%
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding														4.875%
Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] | Senior Notes [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding														7.375%
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding														7.375%
Rowan Companies [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred Tax Assets, Gross						66,000	66,000
Rowan Companies [Member] | United States [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforwards						599,200	599,200
Rowan Companies [Member] | LUXEMBOURG
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforwards						1,400,000	1,400,000
Rowan Companies [Member] | SWITZERLAND
Investments, Owned, Federal Income Tax Note [Line Items]
Net operating loss carryforwards						56,400	$ 56,400
Minimum
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred Tax Assets, Foreign, Expiration Date							2022	2022
Maximum
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred Tax Assets, Foreign, Expiration Date							2026	2026
Operating loss carryforwards tax credits expiration year							2040	2040
Other Liabilities [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Total unrecognized tax benefits						212,200	$ 212,200		213,000
Other Noncurrent Assets [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Total unrecognized tax benefits						1,000	1,000		4,000
Other Current Assets [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Total unrecognized tax benefits						21,100	21,100		20,700
Australian Taxation Office [Member] | Rowan Companies [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Unrecognized tax benefit, maximum exposure			$ 29,000								73,400
Tax Assessment Liability						$ 18,000	18,000
Tax Assessment				$ 42									$ 101
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Income Tax Examination, Estimate of Possible Loss	$ 161,500	€ 142.0									161,500	€ 142.0
Income Tax Examination, Penalties Accrued															$ 105,700	€ 93.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | Uncertain Tax Positions Member
Investments, Owned, Federal Income Tax Note [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions							$ 15,900	€ 14.0	$ 2,300	€ 2.0	$ 89,800	€ 79.0

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- Definition

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- Definition

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- Definition

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No definition available.

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