$VAL
Valaris Ltd Stock $val

$val Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000031480821000007 Filed on March 02, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2018 Q4
Revenue	$296.5M	$512.1M	$399.0M
YoY Change	-42.1%	28.35%	-12.15%
Cost Of Revenue		$476.6M	$322.8M
YoY Change		47.65%
Gross Profit		$35.50M	$76.20M
YoY Change		-53.41%
Gross Profit Margin		6.93%	19.1%
Selling, General & Admin	$26.50M	$42.00M
YoY Change	-36.9%
% of Gross Profit		118.31%
Research & Development	$304.7M	$476.6M
YoY Change	-36.07%
% of Gross Profit		1342.54%
Depreciation & Amortization	$122.4M	$163.8M
YoY Change	-25.27%
% of Gross Profit		461.41%
Operating Expenses	$453.6M	$682.4M
YoY Change	-33.53%
Operating Profit		-$193.1M	-$110.1M
YoY Change		75.39%	-56.55%
Interest Expense	$2.900M	-$118.6M
YoY Change	-102.45%
% of Operating Profit
Other Income/Expense, Net	-$28.40M	$41.90M	-$69.80M
YoY Change	-167.78%	-160.03%	-179.95%
Pretax Income	-$182.6M	-$151.2M	-$179.9M
YoY Change	20.77%	-15.95%	8.31%
Income Tax	-$113.5M	$62.80M	$23.20M
% Of Pretax Income
Net Earnings	-$70.90M	-$216.0M	-$203.6M
YoY Change	-67.18%	6.09%	-1.69%
Net Earnings / Revenue	-23.91%	-42.18%	-51.03%
Basic Earnings Per Share
Diluted Earnings Per Share	-$945.3K	-$2.880M
COMMON SHARES
Basic Shares Outstanding	199.5M shares	197.9M shares	437.1M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2020 Q4	2019 Q4	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$326.0M	$97.00M
YoY Change	236.08%
Cash & Equivalents	$325.8M	$97.20M	$275.1M
Short-Term Investments
Other Short-Term Assets	$386.5M	$446.5M	$360.9M
YoY Change	-13.44%	23.72%	-5.33%
Inventory	$279.4M	$340.1M	$268.1M
Prepaid Expenses	$43.40M	$13.50M	$15.20M
Receivables	$244.0M	$460.0M	$231.7M
Other Receivables	$205.0M	$61.00M	$7.500M
Total Short-Term Assets	$1.173B	$1.064B	$1.310B
YoY Change	10.19%	-18.73%	-18.75%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.96B	$15.10B	$12.62B
YoY Change	-27.4%	19.66%	-2.0%
Goodwill
YoY Change
Intangibles		$11.90M	$2.500M
YoY Change		376.0%	-84.08%
Long-Term Investments	$121.0M	$129.0M
YoY Change	-6.2%
Other Assets	$176.2M	$188.3M	$97.80M
YoY Change	-6.43%	92.54%	-30.24%
Total Long-Term Assets	$11.70B	$15.87B	$12.71B
YoY Change	-26.26%	24.8%	-2.3%
TOTAL ASSETS
Total Short-Term Assets	$1.173B	$1.064B	$1.310B
Total Long-Term Assets	$11.70B	$15.87B	$12.71B
Total Assets	$12.87B	$16.93B	$14.02B
YoY Change	-23.97%	20.73%	-4.12%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$176.4M	$288.2M	$210.5M
YoY Change	-38.79%	36.91%	-51.34%
Accrued Expenses	$142.0M	$327.0M	$113.4M
YoY Change	-56.57%	188.36%
Deferred Revenue	$57.60M	$30.00M	$56.90M
YoY Change	92.0%	-47.28%	-20.86%
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$124.8M	$0.00
YoY Change	-100.0%
Total Short-Term Liabilities	$426.8M	$830.7M	$528.5M
YoY Change	-48.62%	57.18%	-30.32%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$5.924B	$5.010B
YoY Change	-100.0%	18.22%	5.47%
Other Long-Term Liabilities	$762.4M	$867.4M	$396.0M
YoY Change	-12.11%	119.04%	2.4%
Total Long-Term Liabilities	$762.4M	$6.791B	$5.406B
YoY Change	-88.77%	25.61%	5.24%
TOTAL LIABILITIES
Total Short-Term Liabilities	$426.8M	$830.7M	$528.5M
Total Long-Term Liabilities	$762.4M	$6.791B	$5.406B
Total Liabilities	$1.189B	$7.622B	$5.935B
YoY Change	-84.4%	28.42%	0.66%
SHAREHOLDERS EQUITY
Retained Earnings	-$4.184B	$671.7M	$874.2M
YoY Change	-722.87%	-23.16%	-42.96%
Common Stock			$16.00M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$76.20M	$77.30M	$72.20M
YoY Change	-1.42%	7.06%	4.64%
Treasury Stock Shares	6.600M shares	7.900M shares	5.900M shares
Shareholders Equity	$4.375B	$9.311B	$8.091B
YoY Change
Total Liabilities & Shareholders Equity	$12.87B	$16.93B	$14.02B
YoY Change	-23.97%	20.73%	-4.12%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2018 Q4
OPERATING ACTIVITIES
Net Income	-$70.90M	-$216.0M	-$203.6M
YoY Change	-67.18%	6.09%	-1.69%
Depreciation, Depletion And Amortization	$122.4M	$163.8M
YoY Change	-25.27%
Cash From Operating Activities	$144.7M	$150.6M
YoY Change	-3.92%
INVESTING ACTIVITIES
Capital Expenditures	-$10.90M	-$52.80M
YoY Change	-79.36%
Acquisitions
YoY Change
Other Investing Activities	$7.600M	$12.80M
YoY Change	-40.62%
Cash From Investing Activities	-$3.300M	-$40.00M
YoY Change	-91.75%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	3.800M	-143.2M
YoY Change	-102.65%
NET CHANGE
Cash From Operating Activities	144.7M	150.6M
Cash From Investing Activities	-3.300M	-40.00M
Cash From Financing Activities	3.800M	-143.2M
Net Change In Cash	145.2M	-32.60M
YoY Change	-545.4%
FREE CASH FLOW
Cash From Operating Activities	$144.7M	$150.6M
Capital Expenditures	-$10.90M	-$52.80M
Free Cash Flow	$155.6M	$203.4M
YoY Change	-23.5%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-8097
CY2020	dei	Entity Registrant Name EntityRegistrantName	Valaris plc
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	X0
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0635229
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	Cannon Place, 78 Cannon Street
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	London,
CY2020	dei	Entity Address Country EntityAddressCountry	GB
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	EC4N 6AF
CY2020	dei	City Area Code CityAreaCode	+44 (0)
CY2020	dei	Local Phone Number LocalPhoneNumber	20 7659 4660
CY2020	dei	Security12b Title Security12bTitle	Class A ordinary shares, U.S. $0.40 par value
CY2020	dei	Trading Symbol TradingSymbol	VALPQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
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CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	18393800000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2248800000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3296900000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10960500000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	15096900000	USD
CY2020Q4	us-gaap	Due From Joint Ventures Noncurrent DueFromJointVenturesNoncurrent	442700000	USD
CY2019Q4	us-gaap	Due From Joint Ventures Noncurrent DueFromJointVenturesNoncurrent	452900000	USD
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	120900000	USD
CY2019Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	128700000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	176200000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	188300000	USD
CY2020Q4	us-gaap	Assets Assets	12873200000	USD
CY2019Q4	us-gaap	Assets Assets	16931200000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	176400000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	288200000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	250400000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	417700000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	124800000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	426800000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	830700000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5923500000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	762400000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	867400000	USD
CY2020Q4	val	Liabilities Not Subject To Compromise LiabilitiesNotSubjectToCompromise	1189200000	USD
CY2019Q4	val	Liabilities Not Subject To Compromise LiabilitiesNotSubjectToCompromise	7621600000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	7313700000	USD
CY2019Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	0	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	8639900000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	8627800000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-4183800000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	671700000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-87900000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	6200000	USD
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6600000	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	7900000	shares
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	76200000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	77300000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	4374600000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	9310900000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	-4300000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	-1300000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4370300000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9309600000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	12873200000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16931200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-4857600000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-192200000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-636600000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3646200000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	104000000.0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	40300000	USD
CY2020	us-gaap	Depreciation Depreciation	540800000	USD
CY2019	us-gaap	Depreciation Depreciation	609700000	USD
CY2018	us-gaap	Depreciation Depreciation	478900000	USD
CY2020	val	Debtor Reorganization Items Non Cash DebtorReorganizationItemsNonCash	436400000	USD
CY2019	val	Debtor Reorganization Items Non Cash DebtorReorganizationItemsNonCash	0	USD
CY2018	val	Debtor Reorganization Items Non Cash DebtorReorganizationItemsNonCash	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-105700000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	23900000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	56600000	USD
CY2020	val	Debtor In Possession Financing Fees And Payments On Backstop Commitment Agreement DebtorInPossessionFinancingFeesAndPaymentsOnBackstopCommitmentAgreement	40000000.0	USD
CY2019	val	Debtor In Possession Financing Fees And Payments On Backstop Commitment Agreement DebtorInPossessionFinancingFeesAndPaymentsOnBackstopCommitmentAgreement	0	USD
CY2018	val	Debtor In Possession Financing Fees And Payments On Backstop Commitment Agreement DebtorInPossessionFinancingFeesAndPaymentsOnBackstopCommitmentAgreement	0	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	36800000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	31500000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-7200000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	21400000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	37300000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	29900000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-7800000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-12600000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2020	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	-6300000	USD
CY2019	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	637000000.0	USD
CY2018	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	1800000	USD
CY2020	val	Amortization Net AmortizationNet	6200000	USD
CY2019	val	Amortization Net AmortizationNet	-16800000	USD
CY2018	val	Amortization Net AmortizationNet	-40200000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	3100000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	194100000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-19000000.0	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6900000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	11000000.0	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-9900000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-26200000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	22000000.0	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	52500000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	20800000	USD
CY2020	us-gaap	Pension Contributions PensionContributions	12100000	USD
CY2019	us-gaap	Pension Contributions PensionContributions	13200000	USD
CY2018	us-gaap	Pension Contributions PensionContributions	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-251700000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-276900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-55700000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	93800000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	227000000.0	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	426700000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	51800000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	17700000	USD
CY2020	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2019	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	931900000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2020	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	0	USD
CY2019	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	474000000.0	USD
CY2018	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	1030000000.0	USD
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	145000000.0	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	919000000.0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-42000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1051600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-304700000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	596000000.0	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	215000000.0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2020	val	Payments For Debtor In Possession Financing Fees And Backstop Agreement PaymentsForDebtorInPossessionFinancingFeesAndBackstopAgreement	40000000.0	USD
CY2019	val	Payments For Debtor In Possession Financing Fees And Backstop Agreement PaymentsForDebtorInPossessionFinancingFeesAndBackstopAgreement	0	USD
CY2018	val	Payments For Debtor In Possession Financing Fees And Backstop Agreement PaymentsForDebtorInPossessionFinancingFeesAndBackstopAgreement	0	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	15000000.0	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	215000000.0	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	9700000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	928100000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	771200000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	7200000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2020	val	Payment For Debt Solicitation Fees PaymentForDebtSolicitationFees	0	USD
CY2019	val	Payment For Debt Solicitation Fees PaymentForDebtSolicitationFees	9500000	USD
CY2018	val	Payment For Debt Solicitation Fees PaymentForDebtSolicitationFees	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	0	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4500000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17900000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	1000000000.0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	17000000.0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1900000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10200000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5700000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	522200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-952300000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	188200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	0	USD
CY2018	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	2500000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	100000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-300000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-600000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	228600000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-177900000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-170300000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	275100000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	445400000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	325800000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	275100000	USD
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div style="text-align:justify;text-indent:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:400;line-height:120%">Business</span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%"> </span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">We are a leading provider of offshore contract drilling services to the international oil and gas industry. We currently own an offshore drilling rig fleet of 61 rigs, with drilling operations in almost every major offshore market across five continents. Our rig fleet includes 11 drillships, four dynamically positioned semisubmersible rigs, one moored semisubmersible rig and 45 jackup rigs and a 50% equity interest in Saudi Aramco Rowan Offshore Drilling Company ("ARO"), our 50/50 joint venture with Saudi Aramco, which owns an additional seven rigs, We operate the world's largest fleet amongst competitive rigs, including one of the newest ultra-deepwater fleets in the industry and a leading premium jackup fleet. </span></div><div><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">Our customers include many of the leading national and international oil companies, in addition to many independent operators. We are among the most geographically diverse offshore drilling companies, with current operations spanning nine countries on five continents. The markets in which we operate include the Gulf of Mexico, North Sea, the Middle East, West Africa, Australia and Southeast Asia.</span></div><div><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">We provide drilling services on a day rate contract basis. Under day rate contracts, we provide an integrated service that includes the provision of a drilling rig and rig crews for which we receive a daily rate that may vary between the full rate and zero rate throughout the duration of the contractual term, depending on the operations of the rig. We also may receive lump-sum fees or similar compensation for the mobilization, demobilization and capital upgrades of our rigs. Our customers bear substantially all of the costs of constructing the well and supporting drilling operations, as well as the economic risk relative to the success of the well.</span></div>
CY2020	val	Number Of Contract Drilling Rigs NumberOfContractDrillingRigs	61	rigs
CY2020Q4	val	Number Of Different Continents Having Drilling Contracts NumberOfDifferentContinentsHavingDrillingContracts	5	continent
CY2020Q4	us-gaap	Number Of Countries In Which Entity Operates NumberOfCountriesInWhichEntityOperates	9	country
CY2020Q4	val	Number Of Different Continents Having Drilling Contracts NumberOfDifferentContinentsHavingDrillingContracts	5	continent
CY2020	val	Plan Of Reorganization Support Of Revolving Credit Facility Percentage PlanOfReorganizationSupportOfRevolvingCreditFacilityPercentage	1
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-11000000.0	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-7400000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-17200000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	104000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-4855500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-198000000.0	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-631600000	USD
CY2020	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	100000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	500000	USD
CY2020	val	Income Lossfrom Continuing Operations Attributableto Parent Availableto Common Stockholders IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders	-4855500000	USD
CY2019	val	Income Lossfrom Continuing Operations Attributableto Parent Availableto Common Stockholders IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders	-198100000	USD
CY2018	val	Income Lossfrom Continuing Operations Attributableto Parent Availableto Common Stockholders IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders	-632100000	USD
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	400000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	300000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1500000	shares
CY2020Q3	val	Plan Of Reorganization Support Of Noteholders Percentage PlanOfReorganizationSupportOfNoteholdersPercentage	0.72
CY2020	val	Plan Of Reorganization Support Of Revolving Credit Facility Percentage PlanOfReorganizationSupportOfRevolvingCreditFacilityPercentage	1
CY2020Q3	val	Plan Of Reorganization Emergence From Chapter11 Extension Period PlanOfReorganizationEmergenceFromChapter11ExtensionPeriod	P60D
CY2020Q3	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	500000000.0	USD
CY2020Q3	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	500000000.0	USD
CY2020Q3	val	Debtor In Possession Financing Interest Rate On Borrowings Outstanding Paid In Kind DebtorInPossessionFinancingInterestRateOnBorrowingsOutstandingPaidInKind	0.0800
CY2020Q3	val	Debtor In Possession Financing Interest Rate On Borrowings Outstanding Paid In Cash DebtorInPossessionFinancingInterestRateOnBorrowingsOutstandingPaidInCash	0.0700
CY2020Q3	val	Debtor In Possession Maximum Cash Disbursement Percentage DebtorInPossessionMaximumCashDisbursementPercentage	0.15
CY2020Q4	us-gaap	Debtor In Possession Financing Borrowings Outstanding DebtorInPossessionFinancingBorrowingsOutstanding	0	USD
CY2020Q3	val	Backstop Commitment Agreement Shares To Be Allocated BackstopCommitmentAgreementSharesToBeAllocated	0.30
CY2020Q3	val	Backstop Commitment Agreement Cash Settlement BackstopCommitmentAgreementCashSettlement	520000000	USD
CY2020Q3	val	Backstop Commitment Agreement Note Issued BackstopCommitmentAgreementNoteIssued	550000000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	7313700000	USD
CY2020	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	140700000	USD
CY2020	val	Plan Of Reorganization Legal And Other Professional Advisor Fees PlanOfReorganizationLegalAndOtherProfessionalAdvisorFees	64700000	USD
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	447900000	USD
CY2020	us-gaap	Debtor Reorganization Items Net Gain Loss On Rejection Of Leases And Other Executory Contracts1 DebtorReorganizationItemsNetGainLossOnRejectionOfLeasesAndOtherExecutoryContracts1	11500000	USD
CY2020	val	Debtor Reorganization Items Non Cash DebtorReorganizationItemsNonCash	436400000	USD
CY2020	us-gaap	Debtor Reorganization Items Debtor In Possession Facility Financing Costs DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts	20000000.0	USD
CY2020	us-gaap	Debtor Reorganization Items Legal And Advisory Professional Fees DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	66800000	USD
CY2020	us-gaap	Debtor Reorganization Items Provision For Expected Allowed Claims DebtorReorganizationItemsProvisionForExpectedAllowedClaims	4400000	USD
CY2020	val	Debtor Reorganization Items Reorganization Items Fees DebtorReorganizationItemsReorganizationItemsFees	91200000	USD
CY2020	us-gaap	Reorganization Items ReorganizationItems	527600000	USD
CY2020	val	Debtor Reorganization Items Items Fees Unpaid DebtorReorganizationItemsItemsFeesUnpaid	61200000	USD
CY2020	val	Debtor Reorganization Items Items Fees Paid DebtorReorganizationItemsItemsFeesPaid	30000000.0	USD
CY2020Q4	val	Liabilities Subject To Compromise Accrued Interest On Notes LiabilitiesSubjectToCompromiseAccruedInterestOnNotes	203500000	USD
CY2020Q4	val	Liabilities Subject To Compromise Holding Cost Inclusive Of Interest LiabilitiesSubjectToCompromiseHoldingCostInclusiveOfInterest	13900000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	1400000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	3500000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	400000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	0	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	57600000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	30000000.0	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	14300000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	9700000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	3500000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	39700000	USD
CY2020	us-gaap	Contract With Customer Asset Cumulative Catch Up Adjustment To Revenue Change In Measure Of Progress ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress	3100000	USD
CY2020	val	Contractwith Customer Liability Increasefrom Cash Receipts ContractwithCustomerLiabilityIncreasefromCashReceipts	81500000	USD
CY2020	val	Contractwith Customer Liability Revenue Recognized Included In Beginning Balance ContractwithCustomerLiabilityRevenueRecognizedIncludedInBeginningBalance	-24600000	USD
CY2020	val	Contractwith Customer Liability Revenue Recognized Added During Period ContractwithCustomerLiabilityRevenueRecognizedAddedDuringPeriod	-24700000	USD
CY2020	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	-4800000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	1800000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	71900000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	57600000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	14300000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	71900000	USD
CY2020Q4	val	Capitalized Contract Cost Amortization Expense Next Fiscal Year CapitalizedContractCostAmortizationExpenseNextFiscalYear	17400000	USD
CY2020Q4	val	Capitalized Contract Cost Amortization Expense Year Two CapitalizedContractCostAmortizationExpenseYearTwo	4300000	USD
CY2020Q4	val	Capitalized Contract Cost Amortization Expense Year Three CapitalizedContractCostAmortizationExpenseYearThree	500000	USD
CY2020Q4	val	Capitalized Contract Cost Amortization Expense Year Fourand Thereafter CapitalizedContractCostAmortizationExpenseYearFourandThereafter	0	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	22200000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Long Term Debt BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt	203200000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Long Term Debt BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt	1910900000	USD
CY2020	val	Business Combination Bargain Purchase Adjustment Gain Loss BusinessCombinationBargainPurchaseAdjustmentGainLoss	6300000	USD
CY2019	val	Business Combination Bargain Purchase Adjustment Gain Loss BusinessCombinationBargainPurchaseAdjustmentGainLoss	75800000	USD
CY2020Q4	val	Numberof Rigs Ownedby Aro NumberofRigsOwnedbyARO	7	drillship
CY2020Q4	val	Aro Rigs Under Construction ARORigsUnderConstruction	2	drillship
CY2020Q4	val	Numberofjackupsleasedby Aro NumberofjackupsleasedbyARO	9	jackup
CY2020Q4	val	Numberofjackupsleasedby Aro NumberofjackupsleasedbyARO	9	jackup
CY2020Q4	val	Numberof Rigs Ownedby Aro NumberofRigsOwnedbyARO	7	drillship
CY2020	val	Contracts Terms On Purchased Rigs ContractsTermsOnPurchasedRigs	P15Y
CY2020	val	Equity Method Investment Summarized Financial Information Interest Income EquityMethodInvestmentSummarizedFinancialInformationInterestIncome	18300000	USD
CY2020Q4	val	Numberof Newbuild Jackup Rigs NumberofNewbuildJackupRigs	20	jackup
CY2020	val	Order Period OrderPeriod	P10Y
CY2020Q4	val	Aro Rigs Under Construction ARORigsUnderConstruction	2	drillship
CY2020Q4	val	Cost Of Aro Newbuild Jackups Each CostOfARONewbuildJackupsEach	176000000	USD
CY2020Q4	val	Maximum Contingent Contributions To Joint Venture MaximumContingentContributionsToJointVenture	1250000000	USD
CY2020	val	Minimum Renewal Contract Terms For New Build Rigs MinimumRenewalContractTermsForNewBuildRigs	P8Y
CY2020Q4	val	Numberof Rigs Ownedby Aro NumberofRigsOwnedbyARO	7	jackup
CY2020Q4	val	Equity Method Investment Summarized Financial Information Accounts Receivable EquityMethodInvestmentSummarizedFinancialInformationAccountsReceivable	21600000	USD
CY2019Q4	val	Equity Method Investment Summarized Financial Information Accounts Receivable EquityMethodInvestmentSummarizedFinancialInformationAccountsReceivable	21800000	USD
CY2020Q4	us-gaap	Due From Joint Ventures DueFromJointVentures	14200000	USD
CY2020Q4	val	Equity Method Investment Summarized Financial Information Accounts Payable EquityMethodInvestmentSummarizedFinancialInformationAccountsPayable	700000	USD
CY2020Q4	us-gaap	Due From Joint Ventures Noncurrent DueFromJointVenturesNoncurrent	442700000	USD
CY2019Q4	us-gaap	Due From Joint Ventures Noncurrent DueFromJointVenturesNoncurrent	452900000	USD
	val	Equity Method Investment Summarized Financial Information Interest Income EquityMethodInvestmentSummarizedFinancialInformationInterestIncome	16800000	USD
CY2020Q4	val	Equity Method Investment Summarized Financial Information Interest Receivable EquityMethodInvestmentSummarizedFinancialInformationInterestReceivable	0	USD
CY2019Q4	val	Equity Method Investment Summarized Financial Information Interest Receivable EquityMethodInvestmentSummarizedFinancialInformationInterestReceivable	0	USD
CY2020Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	22600000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	22600000	USD
CY2019Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	26000000.0	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	5400000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	31400000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	124800000	USD
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	447900000	USD
CY2020Q4	us-gaap	Debt Instrument Convertible Carrying Amount Of The Equity Component DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent	220000000.0	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	13209300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	18393800000	USD
CY2020	us-gaap	Property Plant And Equipment Gross Period Increase Decrease PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease	-5100000000	USD
CY2019	srt	Average Sales Prices AverageSalesPrices	60
CY2020Q1	srt	Average Sales Prices AverageSalesPrices	20
CY2020Q1	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	2800000000	USD
CY2020Q2	val	Numberof Rigs Impaired NumberofRigsImpaired	2	floater
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2020Q2	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	15000000.0	USD
CY2020Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020Q4	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	2300000	USD
CY2019Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	88200000	USD
CY2019Q4	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	10200000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	124800000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5923500000	USD
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	447900000	USD
CY2020Q3	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	500000000.0	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Borrowings Outstanding DebtorInPossessionFinancingBorrowingsOutstanding	0	USD
CY2020Q4	us-gaap	Debt Instrument Convertible Carrying Amount Of The Equity Component DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent	220000000.0	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	3100000	USD
CY2020Q4	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	951800000	USD
CY2020Q4	us-gaap	Debt Instrument Repurchase Amount DebtInstrumentRepurchaseAmount	724100000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	194100000	USD
CY2019Q4	val	Tender Offer TenderOffer	985000000.0	USD
CY2019Q1	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	595400000	USD
CY2019	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	19000000.0	USD
CY2020Q4	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	951800000	USD
CY2020Q4	us-gaap	Debt Instrument Repurchase Amount DebtInstrumentRepurchaseAmount	724100000	USD
CY2019Q4	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	721800000	USD
CY2019Q4	us-gaap	Debt Instrument Repurchase Amount DebtInstrumentRepurchaseAmount	771200000	USD
CY2020Q3	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	500000000.0	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	6049500000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	6515300000	USD
CY2020	us-gaap	Interest Expense InterestExpense	290600000	USD
CY2019	us-gaap	Interest Expense InterestExpense	428300000	USD
CY2018	us-gaap	Interest Expense InterestExpense	282700000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	20900000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	62600000	USD
CY2020	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	140700000	USD
CY2020Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	3600000	USD
CY2020Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	3600000	USD
CY2019Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	5400000	USD
CY2020Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	5400000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	6300000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	900000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.16
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.04
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	7200000	USD
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	500000000.0	USD
CY2020Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	16300000	shares
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1800000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2500000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2800000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	18100000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	37000000.0	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	30600000	USD
CY2019Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	239300000	USD
CY2019Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	19200000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	848500000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	816000000.0	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	25400000	USD
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	21700000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	100000	USD
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1500000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-97700000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-44000000.0	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Payment For Settlement DefinedBenefitPlanBenefitObligationPaymentForSettlement	6600000	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	3300000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	59200000	USD
	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	34500000	USD
	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	-200000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	902600000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	848500000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	598900000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	576800000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	57900000	USD
	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	43600000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	11500000	USD
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	12800000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Payment For Settlement DefinedBenefitPlanBenefitObligationPaymentForSettlement	6600000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	58600000	USD
	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	34100000	USD
	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	-200000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	603100000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	598900000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	299500000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	249600000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	2900000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	2900000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	296600000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	246700000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	299500000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	249600000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	195400000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	222100000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-104100000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-27500000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	104100000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	27500000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	299500000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	249600000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0294
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate	0.0329
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Period Increase Decrease DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease	49900000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	11500000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	902600000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	844300000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	100000	USD
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1500000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	25400000	USD
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	21300000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	36500000	USD
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	27100000	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	3300000	USD
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	0	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	300000	USD
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-14600000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-4300000	USD
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0329
	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Weighted Average Interest Crediting Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate	0.0329
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0603
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0648
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-51000000.0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	39000000.0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-115100000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-5100000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-102800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	423800000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-135300000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	31300000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-19900000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-18400000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	73200000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	52900000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-153700000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	104500000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	33000000.0	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-92900000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19700000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	52900000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-12800000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	4200000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3700000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-105700000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	23900000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	56600000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-259400000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	128400000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	89600000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit	13800000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit	11700000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	122100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	2272200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1546700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	221200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	41500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	171200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	142900000	USD
CY2020Q4	val	Deferred Tax Assets Premium On Long Term Debt DeferredTaxAssetsPremiumOnLongTermDebt	115700000	USD
CY2019Q4	val	Deferred Tax Assets Premium On Long Term Debt DeferredTaxAssetsPremiumOnLongTermDebt	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	81600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	73900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	1300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	998000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	11600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2868700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2814700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2787700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2588700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	81000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	226000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	40900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	156000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	49500000	USD
CY2020Q4	val	Deferred Tax Liability Domestic Tax On Foreign Income DeferredTaxLiabilityDomesticTaxOnForeignIncome	0	USD
CY2019Q4	val	Deferred Tax Liability Domestic Tax On Foreign Income DeferredTaxLiabilityDomesticTaxOnForeignIncome	36700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	23700000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	52100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	265900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	28900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	39900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	2300000000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	9700000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	171200000	USD
CY2020Q4	val	Operating Loss Carryforwards Interest Limitation Carryforwards OperatingLossCarryforwardsInterestLimitationCarryforwards	221200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Not Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration	9500000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration	223000000.0	USD
CY2020Q4	val	Valuation Allowance On Nol Carryforwards And Ftc Due To Uncertainty Of Realization ValuationAllowanceOnNolCarryforwardsAndFtcDueToUncertaintyOfRealization	2700000000	USD
CY2020Q4	val	Deferred Tax Asset Restructuring Transactions DeferredTaxAssetRestructuringTransactions	998000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.190
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.190
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.190
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.125
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.310
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.014
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.028
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-2.809
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.180
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.024
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.216
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.022
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.015
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1.451
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.169
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies Other EffectiveIncomeTaxRateReconciliationTaxContingenciesOther	0.013
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies Other EffectiveIncomeTaxRateReconciliationTaxContingenciesOther	0.079
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies Other EffectiveIncomeTaxRateReconciliationTaxContingenciesOther	0.017
CY2020	val	Effective Income Tax Rate Reconciliation Bargain Purchase Gain Percent EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent	0
CY2019	val	Effective Income Tax Rate Reconciliation Bargain Purchase Gain Percent EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent	1.897
CY2018	val	Effective Income Tax Rate Reconciliation Bargain Purchase Gain Percent EffectiveIncomeTaxRateReconciliationBargainPurchaseGainPercent	-0.002
CY2020	val	Effective Income Tax Rate Reconciliation Repurchase Of Debt Percent EffectiveIncomeTaxRateReconciliationRepurchaseOfDebtPercent	0
CY2019	val	Effective Income Tax Rate Reconciliation Repurchase Of Debt Percent EffectiveIncomeTaxRateReconciliationRepurchaseOfDebtPercent	0.487
CY2018	val	Effective Income Tax Rate Reconciliation Repurchase Of Debt Percent EffectiveIncomeTaxRateReconciliationRepurchaseOfDebtPercent	-0.016
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.120
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.014
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.051
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-2.013
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.166
CY2020	val	Income Tax Expense Benefit Discrete Item IncomeTaxExpenseBenefitDiscreteItem	322400000	USD
CY2019	val	Income Tax Expense Benefit Discrete Item IncomeTaxExpenseBenefitDiscreteItem	2300000	USD
CY2019	val	Effective Income Tax Rate Reconciliation Debtand Settlement Proceeds EffectiveIncomeTaxRateReconciliationDebtandSettlementProceeds	28300000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	26000000.0	USD
CY2018	val	Income Tax Expense Benefit Discrete Item IncomeTaxExpenseBenefitDiscreteItem	46000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	21000000.0	USD
CY2020	val	Effective Income Tax Rate Continuing Operations Excluding Discrete Items EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems	-0.076
CY2019	val	Effective Income Tax Rate Continuing Operations Excluding Discrete Items EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems	-0.146
CY2018	val	Effective Income Tax Rate Continuing Operations Excluding Discrete Items EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems	-0.248
CY2020	val	Percent Required For Recognition Of Tax Benefit Amounts PercentRequiredForRecognitionOfTaxBenefitAmounts	0.50
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	237700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	296700000	USD
CY2019	val	Unrecognized Tax Benefits Increase Resultingfrom Prior Period Tax Positions With Net Operating Loss Carryforwards UnrecognizedTaxBenefitsIncreaseResultingfromPriorPeriodTaxPositionsWithNetOperatingLossCarryforwards	32500000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	206200000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	237700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	296700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	143000000.0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	89300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2400000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	22400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1100000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	13200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4400000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	12800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	17800000	USD
CY2020	val	Unrecognized Tax Benefits Foreign Currency Translation Gain Loss Arising During Period UnrecognizedTaxBenefitsForeignCurrencyTranslationGainLossArisingDuringPeriod	9000000.0	USD
CY2019	val	Unrecognized Tax Benefits Foreign Currency Translation Gain Loss Arising During Period UnrecognizedTaxBenefitsForeignCurrencyTranslationGainLossArisingDuringPeriod	-300000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8000000.0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	149900000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	237700000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	296700000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	73100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	58900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	13800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	5700000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	1900000	USD
CY2020Q4	val	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Due To Lapses In Statute Of Limitations UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations	4300000	USD
CY2019Q4	val	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Due To Lapses In Statute Of Limitations UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations	5300000	USD
CY2018Q4	val	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Due To Lapses In Statute Of Limitations UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations	5300000	USD
CY2020Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	2300000	USD
CY2020Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1000000.0	USD
CY2020Q4	val	Aggregate Undistributed Earningsof Subsidiariestobe Continually Reinvested AggregateUndistributedEarningsofSubsidiariestobeContinuallyReinvested	268000000.0	USD
CY2020Q4	val	Aggregate Contractual Capital Commitments Due In One Year AggregateContractualCapitalCommitmentsDueInOneYear	83900000	USD
CY2020Q4	val	Aggregate Contractual Capital Commitments Due In Two Years AggregateContractualCapitalCommitmentsDueInTwoYears	165000000.0	USD
CY2020Q4	val	Aggregate Contractual Capital Commitments Due Thereafter AggregateContractualCapitalCommitmentsDueThereafter	0	USD
CY2020Q4	val	Total Aggregate Contractual Capital Commitments TotalAggregateContractualCapitalCommitments	248900000	USD
CY2020Q4	val	Decline In Backlog From Valarisds8 Termination DeclineInBacklogFromVALARISDS8Termination	150000000	USD
CY2020Q4	val	Valarisds8 Loss Contingency Coverage VALARISDS8LossContingencyCoverage	602500	USD
CY2020	us-gaap	Other Operating Income OtherOperatingIncome	118100000	USD
CY2020	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	100000000	USD
CY2020Q1	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	27500000	USD
CY2019	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	20300000	USD
CY2020Q4	val	Numberof Newbuild Jackup Rigs NumberofNewbuildJackupRigs	20	jackup
CY2020	val	Order Period OrderPeriod	P10Y
CY2020Q4	val	Aro Rigs Under Construction ARORigsUnderConstruction	2	drillship
CY2020Q4	val	Maximum Capital Contribution To Aro MaximumCapitalContributionToARO	1250000000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	115100000	USD
CY2020	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	5600000	USD
CY2020	us-gaap	Debtor Reorganization Items Provision For Expected Allowed Claims DebtorReorganizationItemsProvisionForExpectedAllowedClaims	4400000	USD
CY2020Q4	val	Change In Right Of Use Asset For Rejected Leases ChangeInRightOfUseAssetForRejectedLeases	10500000	USD
CY2020Q4	val	Change In Lease Liabilities For Rejected Leases ChangeInLeaseLiabilitiesForRejectedLeases	20400000	USD
CY2020Q4	val	Change In Right Of Use Asset For Corporate Headquarters In Houston Texas ChangeInRightOfUseAssetForCorporateHeadquartersInHoustonTexas	6400000	USD
CY2020Q4	val	Change In Lease Liability For Corporate Headquarters In Houston Texas ChangeInLeaseLiabilityForCorporateHeadquartersInHoustonTexas	10400000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	23300000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	29500000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	19200000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	12200000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	2300000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	2400000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y1M6D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0824
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0823
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	23500000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	29900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	17800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	12000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3000000.0	USD
CY2020	us-gaap	Lease Cost LeaseCost	40200000	USD
CY2019	us-gaap	Lease Cost LeaseCost	39300000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	40100000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	35800000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	58100000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	15700000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21100000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	51800000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	37300000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	72900000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y3M18D
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	9000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	46000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	8700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2000000.0	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	37300000	USD
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	drillship
CY2020	us-gaap	Revenues Revenues	1427200000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	1458600000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3646200000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	540800000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	214600000	USD
CY2020	us-gaap	Other Operating Income OtherOperatingIncome	118100000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-7800000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-4322700000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10960500000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	93800000	USD
CY2019	us-gaap	Revenues Revenues	2053200000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	1806000000.0	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	104000000.0	USD
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	609700000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	188900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-12600000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-668000000.0	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	15096900000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	227000000.0	USD
CY2018	us-gaap	Revenues Revenues	1705400000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	1319400000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	40300000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	478900000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	102700000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-235900000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12616200000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	426700000	USD
CY2020Q4	val	Numberofjackupsleasedby Aro NumberofjackupsleasedbyARO	9	drillship
CY2020Q4	val	Total Number Of Contract Drilling Rigs TotalNumberOfContractDrillingRigs	61	rigs
CY2020Q4	val	Number Of Drilling Management Contracts NumberOfDrillingManagementContracts	2	contract
CY2020Q4	val	Aro Rigs Under Construction ARORigsUnderConstruction	2	drillship
CY2020Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	190600000	USD
CY2019Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	39300000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	465400000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	526700000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	16200000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6000000.0	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	449200000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	520700000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	279400000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	340100000	USD
CY2020Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	43400000	USD
CY2019Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	13500000	USD
CY2020Q4	us-gaap	Prepaid Taxes PrepaidTaxes	32900000	USD
CY2019Q4	us-gaap	Prepaid Taxes PrepaidTaxes	36200000	USD
CY2020Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	17400000	USD
CY2019Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	23300000	USD
CY2020Q4	val	Assets Current Other AssetsCurrentOther	24800000	USD
CY2019Q4	val	Assets Current Other AssetsCurrentOther	33400000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	397900000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	446500000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	66800000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	36300000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	21900000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	26600000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	35800000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	58100000	USD
CY2020Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	22600000	USD
CY2019Q4	us-gaap	Assets Held In Trust Noncurrent AssetsHeldInTrustNoncurrent	26000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2400000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11900000	USD
CY2020Q4	val	Assets Noncurrent Other AssetsNoncurrentOther	26700000	USD
CY2019Q4	val	Assets Noncurrent Other AssetsNoncurrentOther	29400000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	176200000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	188300000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	95600000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	134400000	USD
CY2020Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	57600000	USD
CY2019Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	30000000.0	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	50800000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	61200000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	15700000	USD
CY2018	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	198400000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21100000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	0	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	115200000	USD
CY2020Q4	us-gaap	Settlement Liabilities Current SettlementLiabilitiesCurrent	0	USD
CY2019Q4	us-gaap	Settlement Liabilities Current SettlementLiabilitiesCurrent	20300000	USD
CY2020Q4	val	Liabilities Current Other LiabilitiesCurrentOther	30700000	USD
CY2019Q4	val	Liabilities Current Other LiabilitiesCurrentOther	35500000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	250400000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	417700000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	296600000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	246700000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	286100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	323100000	USD
CY2019	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	303700000	USD
CY2020Q4	val	Intangible Liabilities Noncurrent IntangibleLiabilitiesNoncurrent	50400000	USD
CY2019Q4	val	Intangible Liabilities Noncurrent IntangibleLiabilitiesNoncurrent	52100000	USD
CY2020Q4	val	Supplemental Executive Retirement Plan Liabilities SupplementalExecutiveRetirementPlanLiabilities	22900000	USD
CY2019Q4	val	Supplemental Executive Retirement Plan Liabilities SupplementalExecutiveRetirementPlanLiabilities	26700000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	51800000	USD
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	14300000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	9700000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	13700000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	99000000.0	USD
CY2020Q4	us-gaap	Other Employee Related Liabilities Current And Noncurrent OtherEmployeeRelatedLiabilitiesCurrentAndNoncurrent	11800000	USD
CY2019Q4	us-gaap	Other Employee Related Liabilities Current And Noncurrent OtherEmployeeRelatedLiabilitiesCurrentAndNoncurrent	24500000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	45000000.0	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	33800000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	762400000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	867400000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	98200000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	21700000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	6500000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	7100000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	5600000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	22600000	USD
CY2020Q4	val	Accumulated Other Comprehensive Income Loss Other Net Of Tax AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax	-1800000	USD
CY2019Q4	val	Accumulated Other Comprehensive Income Loss Other Net Of Tax AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax	-1800000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-87900000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	6200000	USD
CY2020	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	200400000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-14600000	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-5800000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	0	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-11000000.0	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-7400000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-17200000	USD
CY2020	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	-6300000	USD
CY2019	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	637000000.0	USD
CY2018	val	Business Combination Bargain Purchase Gain Recognized And Adjustment BusinessCombinationBargainPurchaseGainRecognizedAndAdjustment	1800000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	3100000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	194100000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-19000000.0	USD
CY2020	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2019	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	200000000.0	USD
CY2018	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2020	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	0	USD
CY2019	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	20300000	USD
CY2018	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	0	USD
CY2020	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	3800000	USD
CY2019	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	4800000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	400000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4200000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1004400000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-34800000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-53300000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-29500000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6200000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	63800000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	56600000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	17300000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-11500000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-25400000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2700000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	22000000.0	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	52500000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	20800000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	190000000.0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	410000000.0	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	232600000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	78900000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	107600000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	58400000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1300000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	20900000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	62600000	USD
CY2020	val	Capital Expenditure Accruals CapitalExpenditureAccruals	5400000	USD
CY2019	val	Capital Expenditure Accruals CapitalExpenditureAccruals	16300000	USD
CY2018	val	Capital Expenditure Accruals CapitalExpenditureAccruals	27800000	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	199613642	shares

Files In Submission

Name	View Source	Status
0000314808-21-000007-index-headers.html	Edgar Link	pending
0000314808-21-000007-index.html	Edgar Link	pending
0000314808-21-000007.txt	Edgar Link	pending
0000314808-21-000007-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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$VAL
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2020 Q4 Form 10-K Financial Statement

#000031480821000007 Filed on March 02, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$VAL Valaris Ltd Stock $val

2020 Q4 Form 10-K Financial Statement

#000031480821000007 Filed on March 02, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$VAL
Valaris Ltd Stock $val