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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
	Mar. 31, 2017	Mar. 31, 2016
NET INCOME	$ (24.6)	$ 176.7
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	3.1	3.5
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.9	5.9
Other	0.5	(0.1)
NET OTHER COMPREHENSIVE (LOSS) INCOME	4.5	9.3
COMPREHENSIVE INCOME	(20.1)	186.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.1)	(1.4)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	(21.2)	184.6
Ensco Plc [Member]
NET INCOME	(25.7)	175.3
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0
Other	0.0	0.0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0.0	0.0
COMPREHENSIVE INCOME	(25.7)	175.3
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	(25.7)	175.3
ENSCO International Inc. [Member]
NET INCOME	8.7	(0.4)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	3.1	3.5
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.9	5.9
Other	0.0	0.0
NET OTHER COMPREHENSIVE (LOSS) INCOME	4.0	9.4
COMPREHENSIVE INCOME	12.7	9.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	12.7	9.0
Pride International, Inc. [Member]
NET INCOME	7.6	34.5
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0
Other	0.0	0.0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0.0	0.0
COMPREHENSIVE INCOME	7.6	34.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	7.6	34.5
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET INCOME	50.4	272.7
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0
Other	0.5	(0.1)
NET OTHER COMPREHENSIVE (LOSS) INCOME	0.5	(0.1)
COMPREHENSIVE INCOME	50.9	272.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.1)	(1.4)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	49.8	271.2
Consolidating Adjustments [Member]
NET INCOME	(65.6)	(305.4)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0
Other	0.0	0.0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0.0	0.0
COMPREHENSIVE INCOME	(65.6)	(305.4)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ (65.6)	$ (305.4)

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