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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 32 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations $ 2,057.9us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 1,811.2us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 1,954.6us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations  
INVESTING ACTIVITIES        
Additions to property and equipment (1,568.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,763.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,713.2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Purchases of short-term investments (790.6)us-gaap_PaymentsForProceedsFromShortTermInvestments (50.0)us-gaap_PaymentsForProceedsFromShortTermInvestments (90.0)us-gaap_PaymentsForProceedsFromShortTermInvestments  
Maturities of short-term investments 83.3us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 50.0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments 44.5us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments  
Proceeds from Sale of Property, Plant, and Equipment 169.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 6.0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 3.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Net cash used in investing activities of continuing operations (2,106.9)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,757.5)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,755.5)us-gaap_NetCashProvidedByUsedInInvestingActivities  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 1,246.4us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt  
Cash dividends paid (703.0)us-gaap_PaymentsOfDividendsCommonStock (525.6)us-gaap_PaymentsOfDividendsCommonStock (348.1)us-gaap_PaymentsOfDividendsCommonStock  
Commercial paper borrowings, net 0us-gaap_ProceedsFromRepaymentsOfCommercialPaper 0us-gaap_ProceedsFromRepaymentsOfCommercialPaper (125.0)us-gaap_ProceedsFromRepaymentsOfCommercialPaper  
Equity financing costs 0us-gaap_PaymentsOfStockIssuanceCosts 0us-gaap_PaymentsOfStockIssuanceCosts 66.7us-gaap_PaymentsOfStockIssuanceCosts  
Reduction of long-term borrowings (60.1)us-gaap_RepaymentsOfLongTermDebt (47.5)us-gaap_RepaymentsOfLongTermDebt (47.5)us-gaap_RepaymentsOfLongTermDebt  
Proceeds from exercise of share options 2.6us-gaap_ProceedsFromStockOptionsExercised 22.3us-gaap_ProceedsFromStockOptionsExercised 35.8us-gaap_ProceedsFromStockOptionsExercised  
Debt financing costs (13.4)us-gaap_PaymentsOfDebtIssuanceCosts (4.6)us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts  
Advances (to) from affiliates 0us-gaap_PaymentsForAdvanceToAffiliate 0us-gaap_PaymentsForAdvanceToAffiliate 0us-gaap_PaymentsForAdvanceToAffiliate  
Other (29.8)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (21.7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (17.4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities  
Net cash (used in) provided by financing activities of continuing operations 442.7us-gaap_NetCashProvidedByUsedInFinancingActivities (577.1)us-gaap_NetCashProvidedByUsedInFinancingActivities (435.5)us-gaap_NetCashProvidedByUsedInFinancingActivities  
DISCONTINUED OPERATIONS        
Operating activities (3.8)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 169.3us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 232.5us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations  
Investing activities 109.3us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations 32.8us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations 58.3us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations  
Net cash provided by discontinued operations 105.5us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 202.1us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 290.8us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 311.1us-gaap_NetCashProvidedByUsedInDiscontinuedOperations [1]
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (0.2)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2.0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 499.2us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (321.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 56.4us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 165.6us-gaap_CashAndCashEquivalentsAtCarryingValue 487.1us-gaap_CashAndCashEquivalentsAtCarryingValue 430.7us-gaap_CashAndCashEquivalentsAtCarryingValue  
CASH AND CASH EQUIVALENTS, END OF YEAR 664.8us-gaap_CashAndCashEquivalentsAtCarryingValue 165.6us-gaap_CashAndCashEquivalentsAtCarryingValue 487.1us-gaap_CashAndCashEquivalentsAtCarryingValue 664.8us-gaap_CashAndCashEquivalentsAtCarryingValue
Ensco Plc [Member]        
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations (63.8)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (114.8)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (71.6)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
INVESTING ACTIVITIES        
Additions to property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Purchases of short-term investments (716.1)us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Maturities of short-term investments 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Proceeds from Sale of Property, Plant, and Equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (0.3)us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Net cash used in investing activities of continuing operations (716.1)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (0.3)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 1,246.4us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		      
Cash dividends paid (703.0)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (525.6)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (348.1)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Commercial paper borrowings, net     (125.0)us-gaap_ProceedsFromRepaymentsOfCommercialPaper
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Equity financing costs     66.7us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Reduction of long-term borrowings 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Proceeds from exercise of share options 2.6us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 22.3us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 23.9us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Debt financing costs (13.4)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		    
Advances (to) from affiliates 501.9us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 407.2us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 501.2us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Other (13.7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (14.4)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (11.6)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Net cash (used in) provided by financing activities of continuing operations 1,020.8us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (110.5)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 107.1us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
DISCONTINUED OPERATIONS        
Operating activities 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Investing activities 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Net cash provided by discontinued operations 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 240.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 (225.3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 35.2us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 46.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 271.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 236.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		  
CASH AND CASH EQUIVALENTS, END OF YEAR 287.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 46.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 271.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember		 287.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoPlcMember
ENSCO International Inc. [Member]        
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations (167.6)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (128.7)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (38.2)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
INVESTING ACTIVITIES        
Additions to property and equipment (37.2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Purchases of short-term investments 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Maturities of short-term investments 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Proceeds from Sale of Property, Plant, and Equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (4.1)us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0.4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Net cash used in investing activities of continuing operations (37.2)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (4.1)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0.4us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		      
Cash dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Commercial paper borrowings, net     0us-gaap_ProceedsFromRepaymentsOfCommercialPaper
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Equity financing costs     0us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Reduction of long-term borrowings 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Proceeds from exercise of share options 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 11.9us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Debt financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (4.6)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		    
Advances (to) from affiliates 204.3us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 136.2us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 27.6us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Net cash (used in) provided by financing activities of continuing operations 204.3us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 131.6us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 39.5us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
DISCONTINUED OPERATIONS        
Operating activities 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Investing activities 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Net cash provided by discontinued operations 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (0.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 (1.2)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 1.7us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 0.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 1.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		  
CASH AND CASH EQUIVALENTS, END OF YEAR 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 1.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_EnscoInternationalIncMember
Pride International Inc. [Member]        
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations (90.9)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 (62.9)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 (21.6)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
INVESTING ACTIVITIES        
Additions to property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Purchases of short-term investments 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Maturities of short-term investments 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Proceeds from Sale of Property, Plant, and Equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Net cash used in investing activities of continuing operations 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		      
Cash dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Commercial paper borrowings, net     0us-gaap_ProceedsFromRepaymentsOfCommercialPaper
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Equity financing costs     0us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Reduction of long-term borrowings 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Proceeds from exercise of share options 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Debt financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		    
Advances (to) from affiliates 176.8us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 (17.2)us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 84.0us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Net cash (used in) provided by financing activities of continuing operations 176.8us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 (17.2)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 84.0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
DISCONTINUED OPERATIONS        
Operating activities 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Investing activities 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Net cash provided by discontinued operations 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 85.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 (80.1)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 62.4us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 4.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 85.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 22.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		  
CASH AND CASH EQUIVALENTS, END OF YEAR 90.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 4.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 85.0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember		 90.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_PrideInternationalIncMember
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations 2,380.2us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 2,117.6us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 2,086.0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
INVESTING ACTIVITIES        
Additions to property and equipment (1,531.6)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (1,763.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (1,713.2)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Purchases of short-term investments (74.5)us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (50.0)us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (90.0)us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Maturities of short-term investments 83.3us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 50.0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 44.5us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Proceeds from Sale of Property, Plant, and Equipment 169.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 10.1us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 3.1us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Net cash used in investing activities of continuing operations (1,353.6)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (1,753.4)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (1,755.6)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		      
Cash dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Commercial paper borrowings, net     0us-gaap_ProceedsFromRepaymentsOfCommercialPaper
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Equity financing costs     0us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Reduction of long-term borrowings (60.1)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (47.5)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (47.5)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Proceeds from exercise of share options 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Debt financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		    
Advances (to) from affiliates (883.0)us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (526.2)us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (612.8)us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Other (16.1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (7.3)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (5.8)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Net cash (used in) provided by financing activities of continuing operations (959.2)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (581.0)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (666.1)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
DISCONTINUED OPERATIONS        
Operating activities (3.8)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 169.3us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 232.5us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Investing activities 109.3us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 32.8us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 58.3us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Net cash provided by discontinued operations 105.5us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 202.1us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 290.8us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (0.2)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 2.0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 172.9us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (14.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 (42.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 113.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 128.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 171.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		  
CASH AND CASH EQUIVALENTS, END OF YEAR 286.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 113.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 128.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember		 286.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_OtherNonGuarantorSubsidiariesMember
Consolidating Adjustments [Member]        
OPERATING ACTIVITIES        
Net cash (used in) provided by operating activities of continuing operations 0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
INVESTING ACTIVITIES        
Additions to property and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Purchases of short-term investments 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsForProceedsFromShortTermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Maturities of short-term investments 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Proceeds from Sale of Property, Plant, and Equipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Net cash used in investing activities of continuing operations 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		      
Cash dividends paid 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Commercial paper borrowings, net     0us-gaap_ProceedsFromRepaymentsOfCommercialPaper
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Equity financing costs     0us-gaap_PaymentsOfStockIssuanceCosts
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Reduction of long-term borrowings 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Proceeds from exercise of share options 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Debt financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		    
Advances (to) from affiliates 0us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_PaymentsForAdvanceToAffiliate
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Other 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Net cash (used in) provided by financing activities of continuing operations 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
DISCONTINUED OPERATIONS        
Operating activities 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Investing activities 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Net cash provided by discontinued operations 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		  
CASH AND CASH EQUIVALENTS, END OF YEAR $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember		 $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= esv_ConsolidatedAdjustmentsMember
[1] The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2014 and were previously included within the operating segment noted in the above table.