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Guarantee Of Registered Securities Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
NET INCOME (LOSS)	$ 293.8	$ 432.9	$ 884.4	$ (440.0)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	(14.8)	(12.7)	(23.5)	(2.8)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	5.8	(1.4)	15.9	(3.3)
Other	2.9	3.7	4.2	4.2
NET OTHER COMPREHENSIVE (LOSS) INCOME	(6.1)	(10.4)	(3.4)	(1.9)
COMPREHENSIVE INCOME	287.7	422.5	881.0	(441.9)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.8)	(3.5)	(7.4)	(10.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	285.9	419.0	873.6	(452.7)
Ensco Plc [Member]
NET INCOME (LOSS)	292.0	429.4	877.0	(450.8)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
COMPREHENSIVE INCOME	292.0	429.4	877.0	(450.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	292.0	429.4	877.0	(450.8)
ENSCO International Inc. [Member]
NET INCOME (LOSS)	98.7	52.0	144.1	(1,382.8)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	(14.8)	(12.7)	(23.5)	(2.8)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	5.8	(1.4)	15.9	(3.3)
NET OTHER COMPREHENSIVE (LOSS) INCOME	(9.0)	(14.1)	(7.6)	(6.1)
COMPREHENSIVE INCOME	89.7	37.9	136.5	(1,388.9)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	89.7	37.9	136.5	(1,388.9)
Pride International, Inc. [Member]
NET INCOME (LOSS)	(1.1)	53.8	103.1	(1,541.9)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
COMPREHENSIVE INCOME	(1.1)	53.8	103.1	(1,541.9)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	(1.1)	53.8	103.1	(1,541.9)
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET INCOME (LOSS)	368.4	493.4	1,156.4	(247.0)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Other	2.9	3.7	4.2	4.2
NET OTHER COMPREHENSIVE (LOSS) INCOME	2.9	3.7	4.2	4.2
COMPREHENSIVE INCOME	371.3	497.1	1,160.6	(242.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.8)	(3.5)	(7.4)	(10.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	369.5	493.6	1,153.2	(253.6)
Consolidating Adjustments [Member]
NET INCOME (LOSS)	(464.2)	(595.7)	(1,396.2)	3,182.5
OTHER COMPREHENSIVE INCOME (LOSS), NET:
COMPREHENSIVE INCOME	(464.2)	(595.7)	(1,396.2)	3,182.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ (464.2)	$ (595.7)	$ (1,396.2)	$ 3,182.5

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