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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
CURRENT ASSETS    
Cash and cash equivalents $ 664,800,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 165,600,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term Investments 757,300,000us-gaap_ShortTermInvestments 50,000,000us-gaap_ShortTermInvestments
Accounts receivable, net 883,300,000us-gaap_ReceivablesNetCurrent 855,700,000us-gaap_ReceivablesNetCurrent
Other 629,400,000us-gaap_OtherAssetsCurrent 463,900,000us-gaap_OtherAssetsCurrent
Total current assets 2,934,800,000us-gaap_AssetsCurrent 1,535,200,000us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, AT COST 14,975,500,000us-gaap_PropertyPlantAndEquipmentGross 17,498,500,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 2,440,700,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 3,187,500,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 12,534,800,000us-gaap_PropertyPlantAndEquipmentNet 14,311,000,000us-gaap_PropertyPlantAndEquipmentNet
GOODWILL 276,100,000us-gaap_Goodwill 3,274,000,000us-gaap_Goodwill
OTHER ASSETS, NET 314,200,000us-gaap_OtherAssetsNoncurrent 352,700,000us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS 16,059,900,000us-gaap_Assets 19,472,900,000us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable - trade 373,200,000us-gaap_AccountsPayableCurrent 341,100,000us-gaap_AccountsPayableCurrent
Accrued liabilities and other 696,600,000us-gaap_OtherLiabilitiesCurrent 658,700,000us-gaap_OtherLiabilitiesCurrent
Short-term debt 0us-gaap_CommercialPaper 0us-gaap_CommercialPaper
Current maturities of long-term debt 34,800,000us-gaap_LongTermDebtCurrent 47,500,000us-gaap_LongTermDebtCurrent
Total current liabilities 1,104,600,000us-gaap_LiabilitiesCurrent 1,047,300,000us-gaap_LiabilitiesCurrent
LONG-TERM DEBT 5,885,600,000us-gaap_LongTermDebtNoncurrent 4,718,900,000us-gaap_LongTermDebtNoncurrent
DEFERRED INCOME TAXES 179,500,000us-gaap_DeferredTaxLiabilitiesNoncurrent 362,100,000us-gaap_DeferredTaxLiabilitiesNoncurrent
OTHER LIABILITIES 667,300,000us-gaap_OtherLiabilitiesNoncurrent 545,700,000us-gaap_OtherLiabilitiesNoncurrent
ENSCO SHAREHOLDERS' EQUITY    
Additional paid-in capital 5,517,500,000us-gaap_AdditionalPaidInCapital 5,467,200,000us-gaap_AdditionalPaidInCapital
Retained earnings 2,720,400,000us-gaap_RetainedEarningsAccumulatedDeficit 7,327,300,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 11,900,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 18,200,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury shares, at cost, 6.5 million shares and 6.0 million shares (59,000,000)us-gaap_TreasuryStockValue (45,200,000)us-gaap_TreasuryStockValue
Total Ensco shareholders' equity 8,215,000,000us-gaap_StockholdersEquity 12,791,600,000us-gaap_StockholdersEquity
NONCONTROLLING INTERESTS 7,900,000us-gaap_MinorityInterest 7,300,000us-gaap_MinorityInterest
Total equity 8,222,900,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 12,798,900,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and shareholders' equity 16,059,900,000us-gaap_LiabilitiesAndStockholdersEquity 19,472,900,000us-gaap_LiabilitiesAndStockholdersEquity
Class A Ordinary Shares, U.S. [Member]    
ENSCO SHAREHOLDERS' EQUITY    
Common shares, value 24,100,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 24,000,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Class B, Par Value In GBP [Member]    
ENSCO SHAREHOLDERS' EQUITY    
Common shares, value $ 100,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 100,000us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember