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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
OPERATING REVENUES	$ 1,159.8us-gaap_RevenueOilAndGasServices	$ 1,201.4us-gaap_RevenueOilAndGasServices	$ 1,136.6us-gaap_RevenueOilAndGasServices	$ 1,066.7us-gaap_RevenueOilAndGasServices	$ 1,138.0us-gaap_RevenueOilAndGasServices	$ 1,119.9us-gaap_RevenueOilAndGasServices	$ 1,076.1us-gaap_RevenueOilAndGasServices	$ 989.4us-gaap_RevenueOilAndGasServices	$ 4,564.5us-gaap_RevenueOilAndGasServices	$ 4,323.4us-gaap_RevenueOilAndGasServices	$ 3,638.8us-gaap_RevenueOilAndGasServices
Contract drilling (exclusive of depreciation)	514.0us-gaap_CostOfServicesOilAndGas	500.2us-gaap_CostOfServicesOilAndGas	542.5us-gaap_CostOfServicesOilAndGas	520.2us-gaap_CostOfServicesOilAndGas	500.4us-gaap_CostOfServicesOilAndGas	499.2us-gaap_CostOfServicesOilAndGas	496.1us-gaap_CostOfServicesOilAndGas	451.4us-gaap_CostOfServicesOilAndGas	2,076.9us-gaap_CostOfServicesOilAndGas	1,947.1us-gaap_CostOfServicesOilAndGas	1,642.8us-gaap_CostOfServicesOilAndGas
Asset Impairment Charges	3,515.2us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	703.5us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges					4,218.7us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Depreciation	139.4us-gaap_CostOfServicesDepreciation	135.2us-gaap_CostOfServicesDepreciation	132.2us-gaap_CostOfServicesDepreciation	131.1us-gaap_CostOfServicesDepreciation	127.5us-gaap_CostOfServicesDepreciation	124.7us-gaap_CostOfServicesDepreciation	124.0us-gaap_CostOfServicesDepreciation	120.0us-gaap_CostOfServicesDepreciation	537.9us-gaap_CostOfServicesDepreciation	496.2us-gaap_CostOfServicesDepreciation	443.8us-gaap_CostOfServicesDepreciation
General and administrative	28.3us-gaap_GeneralAndAdministrativeExpense	29.3us-gaap_GeneralAndAdministrativeExpense	36.2us-gaap_GeneralAndAdministrativeExpense	38.1us-gaap_GeneralAndAdministrativeExpense	35.2us-gaap_GeneralAndAdministrativeExpense	37.4us-gaap_GeneralAndAdministrativeExpense	36.4us-gaap_GeneralAndAdministrativeExpense	37.8us-gaap_GeneralAndAdministrativeExpense	131.9us-gaap_GeneralAndAdministrativeExpense	146.8us-gaap_GeneralAndAdministrativeExpense	148.9us-gaap_GeneralAndAdministrativeExpense
OPERATING INCOME	(3,037.1)us-gaap_OperatingIncomeLoss	536.7us-gaap_OperatingIncomeLoss	(277.8)us-gaap_OperatingIncomeLoss	377.3us-gaap_OperatingIncomeLoss	474.9us-gaap_OperatingIncomeLoss	458.6us-gaap_OperatingIncomeLoss	419.6us-gaap_OperatingIncomeLoss	380.2us-gaap_OperatingIncomeLoss	(2,400.9)us-gaap_OperatingIncomeLoss	1,733.3us-gaap_OperatingIncomeLoss	1,403.3us-gaap_OperatingIncomeLoss
OTHER (EXPENSE) INCOME, NET	(49.6)us-gaap_NonoperatingIncomeExpense	(38.4)us-gaap_NonoperatingIncomeExpense	(30.8)us-gaap_NonoperatingIncomeExpense	(29.1)us-gaap_NonoperatingIncomeExpense	(28.9)us-gaap_NonoperatingIncomeExpense	(1.6)us-gaap_NonoperatingIncomeExpense	(39.8)us-gaap_NonoperatingIncomeExpense	(29.8)us-gaap_NonoperatingIncomeExpense	(147.9)us-gaap_NonoperatingIncomeExpense	(100.1)us-gaap_NonoperatingIncomeExpense	(98.6)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(3,086.7)	498.3	(308.6)	348.2	446.0	457.0	379.8	350.4	(2,548.8)	1,633.2	1,304.7
Total provision for income taxes	(26.2)us-gaap_IncomeTaxExpenseBenefit	74.6us-gaap_IncomeTaxExpenseBenefit	42.6us-gaap_IncomeTaxExpenseBenefit	49.5us-gaap_IncomeTaxExpenseBenefit	44.6us-gaap_IncomeTaxExpenseBenefit	67.5us-gaap_IncomeTaxExpenseBenefit	43.2us-gaap_IncomeTaxExpenseBenefit	47.8us-gaap_IncomeTaxExpenseBenefit	140.5us-gaap_IncomeTaxExpenseBenefit	203.1us-gaap_IncomeTaxExpenseBenefit	228.6us-gaap_IncomeTaxExpenseBenefit
DISCONTINUED OPERATIONS, NET	(388.0)	9.2	(818.4)	(2.0)	(37.4)	(8.1)	26.0	17.3	(1,199.2)	(2.2)	100.6
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0	0	0
NET INCOME	(3,448.5)us-gaap_ProfitLoss	432.9us-gaap_ProfitLoss	(1,169.6)us-gaap_ProfitLoss	296.7us-gaap_ProfitLoss	364.0us-gaap_ProfitLoss	381.4us-gaap_ProfitLoss	362.6us-gaap_ProfitLoss	319.9us-gaap_ProfitLoss	(3,888.5)us-gaap_ProfitLoss	1,427.9us-gaap_ProfitLoss	1,176.7us-gaap_ProfitLoss
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(3.3)	(3.5)	(3.1)	(4.2)	(2.6)	(2.6)	(1.7)	(2.8)	(14.1)	(9.7)	(7.0)
NET INCOME ATTRIBUTABLE TO ENSCO	(3,451.8)us-gaap_NetIncomeLoss	429.4us-gaap_NetIncomeLoss	(1,172.7)us-gaap_NetIncomeLoss	292.5us-gaap_NetIncomeLoss	361.4us-gaap_NetIncomeLoss	378.8us-gaap_NetIncomeLoss	360.9us-gaap_NetIncomeLoss	317.1us-gaap_NetIncomeLoss	(3,902.6)us-gaap_NetIncomeLoss	1,418.2us-gaap_NetIncomeLoss	1,169.7us-gaap_NetIncomeLoss
Ensco Plc [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									34.5	35.0	44.0
Contract drilling (exclusive of depreciation)									31.8	27.5	51.2
Asset Impairment Charges									0
Depreciation									0.2	0.3	0.4
General and administrative									52.0	63.5	63.8
OPERATING INCOME									(49.5)	(56.3)	(71.4)
OTHER (EXPENSE) INCOME, NET									(67.0)	(65.6)	(41.8)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(116.5)	(121.9)	(113.2)
Total provision for income taxes									0	0	0
DISCONTINUED OPERATIONS, NET									0	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									(3,786.1)	1,540.1	1,282.9
NET INCOME									(3,902.6)	1,418.2	1,169.7
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO									(3,902.6)	1,418.2	1,169.7
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									145.4	149.4	147.6
Contract drilling (exclusive of depreciation)									145.4	149.4	147.6
Asset Impairment Charges									0
Depreciation									7.6	4.0	3.5
General and administrative									0.4	0.5	0.4
OPERATING INCOME									(8.0)	(4.5)	(3.9)
OTHER (EXPENSE) INCOME, NET									(43.3)	(9.4)	(7.0)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(51.3)	(13.9)	(10.9)
Total provision for income taxes									(44.9)	92.5	68.8
DISCONTINUED OPERATIONS, NET									0	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									(3,651.0)	366.2	335.9
NET INCOME									(3,657.4)	259.8	256.2
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO									(3,657.4)	259.8	256.2
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									0	0	0
Contract drilling (exclusive of depreciation)									0	0	0
Asset Impairment Charges									0
Depreciation									0	0	0
General and administrative									0	0	0
OPERATING INCOME									0	0	0
OTHER (EXPENSE) INCOME, NET									(54.7)	(27.9)	(50.0)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(54.7)	(27.9)	(50.0)
Total provision for income taxes									0	0	0
DISCONTINUED OPERATIONS, NET									0	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									(3,744.3)	111.6	239.2
NET INCOME									(3,799.0)	83.7	189.2
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO									(3,799.0)	83.7	189.2
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									4,683.0	4,446.4	3,767.3
Contract drilling (exclusive of depreciation)									2,198.1	2,077.6	1,764.1
Asset Impairment Charges									4,218.7
Depreciation									530.1	491.9	439.9
General and administrative									79.5	82.8	84.7
OPERATING INCOME									(2,343.4)	1,794.1	1,478.6
OTHER (EXPENSE) INCOME, NET									17.1	2.8	0.2
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(2,326.3)	1,796.9	1,478.8
Total provision for income taxes									185.4	110.6	159.8
DISCONTINUED OPERATIONS, NET									(1,199.2)	(2.2)	100.6
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0	0	0
NET INCOME									(3,710.9)	1,684.1	1,419.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(14.1)	(9.7)	(7.0)
NET INCOME ATTRIBUTABLE TO ENSCO									(3,725.0)	1,674.4	1,412.6
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									(298.4)	(307.4)	(320.1)
Contract drilling (exclusive of depreciation)									(298.4)	(307.4)	(320.1)
Asset Impairment Charges									0
Depreciation									0	0	0
General and administrative									0	0	0
OPERATING INCOME									0	0	0
OTHER (EXPENSE) INCOME, NET									0	0	0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									0	0	0
Total provision for income taxes									0	0	0
DISCONTINUED OPERATIONS, NET									0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									11,181.4	(2,017.9)	(1,858.0)
NET INCOME									11,181.4	(2,017.9)	(1,858.0)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO									$ 11,181.4	$ (2,017.9)	$ (1,858.0)