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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
CURRENT ASSETS    
Cash and cash equivalents $ 887,800,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 664,800,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term Investments 745,300,000us-gaap_ShortTermInvestments 757,300,000us-gaap_ShortTermInvestments
Accounts receivable, net 795,400,000us-gaap_ReceivablesNetCurrent 883,300,000us-gaap_ReceivablesNetCurrent
Other 625,300,000us-gaap_OtherAssetsCurrent 629,400,000us-gaap_OtherAssetsCurrent
Total current assets 3,053,800,000us-gaap_AssetsCurrent 2,934,800,000us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, AT COST 15,303,000,000us-gaap_PropertyPlantAndEquipmentGross 14,975,500,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 2,577,700,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 2,440,700,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 12,725,300,000us-gaap_PropertyPlantAndEquipmentNet 12,534,800,000us-gaap_PropertyPlantAndEquipmentNet
GOODWILL 276,100,000us-gaap_Goodwill 276,100,000us-gaap_Goodwill
OTHER ASSETS, NET 291,000,000us-gaap_OtherAssetsNoncurrent 314,200,000us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS 16,346,200,000us-gaap_Assets 16,059,900,000us-gaap_Assets
CURRENT LIABILITIES    
Accounts payable - trade 296,500,000us-gaap_AccountsPayableCurrent 373,200,000us-gaap_AccountsPayableCurrent
Accrued liabilities and other 625,600,000us-gaap_OtherLiabilitiesCurrent 696,600,000us-gaap_OtherLiabilitiesCurrent
Current maturities of long-term debt 211,500,000us-gaap_LongTermDebtCurrent 34,800,000us-gaap_LongTermDebtCurrent
Total current liabilities 1,133,600,000us-gaap_LiabilitiesCurrent 1,104,600,000us-gaap_LiabilitiesCurrent
LONG-TERM DEBT 5,919,300,000us-gaap_LongTermDebtNoncurrent 5,885,600,000us-gaap_LongTermDebtNoncurrent
DEFERRED INCOME TAXES 182,100,000us-gaap_DeferredTaxLiabilitiesNoncurrent 179,500,000us-gaap_DeferredTaxLiabilitiesNoncurrent
OTHER LIABILITIES 596,100,000us-gaap_OtherLiabilitiesNoncurrent 667,300,000us-gaap_OtherLiabilitiesNoncurrent
COMMITMENTS AND CONTINGENCIES      
ENSCO SHAREHOLDERS' EQUITY    
Additional paid-in capital 5,526,900,000us-gaap_AdditionalPaidInCapital 5,517,500,000us-gaap_AdditionalPaidInCapital
Retained earnings 3,011,000,000us-gaap_RetainedEarningsAccumulatedDeficit 2,720,400,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 2,100,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 11,900,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury shares, at cost (59,700,000)us-gaap_TreasuryStockValue (59,000,000)us-gaap_TreasuryStockValue
Total Ensco shareholders' equity 8,504,500,000us-gaap_StockholdersEquity 8,215,000,000us-gaap_StockholdersEquity
NONCONTROLLING INTERESTS 10,600,000us-gaap_MinorityInterest 7,900,000us-gaap_MinorityInterest
Total equity 8,515,100,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 8,222,900,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and shareholders' equity 16,346,200,000us-gaap_LiabilitiesAndStockholdersEquity 16,059,900,000us-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		 24,100,000us-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