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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	$ 87.3	$ 293.8	$ 856.6	$ 884.4
Net change in fair value of derivatives	0.0	(14.8)	(0.6)	(23.5)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	2.2	5.8	10.1	15.9
Other	(0.5)	2.9	(0.5)	4.2
NET OTHER COMPREHENSIVE (LOSS) INCOME	1.7	(6.1)	9.0	(3.4)
COMPREHENSIVE INCOME	89.0	287.7	865.6	881.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.0)	(1.8)	(5.4)	(7.4)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	87.0	285.9	860.2	873.6
Ensco Plc [Member]
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	85.3	292.0	851.2	877.0
COMPREHENSIVE INCOME	85.3	292.0	851.2	877.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	85.3	292.0	851.2	877.0
ENSCO International Inc. [Member]
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	26.5	98.7	49.1	144.1
Net change in fair value of derivatives	0.0	(14.8)	(0.6)	(23.5)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	2.2	5.8	10.1	15.9
NET OTHER COMPREHENSIVE (LOSS) INCOME	2.2	(9.0)	9.5	(7.6)
COMPREHENSIVE INCOME	28.7	89.7	58.6	136.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	28.7	89.7	58.6	136.5
Pride International, Inc. [Member]
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	4.9	(1.1)	30.8	103.1
COMPREHENSIVE INCOME	4.9	(1.1)	30.8	103.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	4.9	(1.1)	30.8	103.1
Other Non-Guarantor Subsidiaries Of Ensco [Member]
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	135.7	368.4	790.7	1,156.4
Other	(0.5)	2.9	(0.5)	4.2
NET OTHER COMPREHENSIVE (LOSS) INCOME	(0.5)	2.9	(0.5)	4.2
COMPREHENSIVE INCOME	135.2	371.3	790.2	1,160.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.0)	(1.8)	(5.4)	(7.4)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	133.2	369.5	784.8	1,153.2
Consolidating Adjustments [Member]
OTHER COMPREHENSIVE INCOME (LOSS), NET:
NET INCOME	(165.1)	(464.2)	(865.2)	(1,396.2)
COMPREHENSIVE INCOME	(165.1)	(464.2)	(865.2)	(1,396.2)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ (165.1)	$ (464.2)	$ (865.2)	$ (1,396.2)

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