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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, 2018	Mar. 31, 2017
NET LOSS	$ (140.5)	$ (24.6)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	2.7	3.1
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(2.2)	0.9
Other	(0.1)	0.5
NET OTHER COMPREHENSIVE INCOME	0.4	4.5
COMPREHENSIVE LOSS	(140.1)	(20.1)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.4	(1.1)
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(139.7)	(21.2)
Ensco Plc [Member]
NET LOSS	(140.1)	(25.7)
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	0.0	0.0
NET OTHER COMPREHENSIVE INCOME	0.0	0.0
COMPREHENSIVE LOSS	(140.1)	(25.7)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(140.1)	(25.7)
ENSCO International Inc. [Member]
NET LOSS	(11.5)	8.7
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	2.7	3.1
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(2.2)	0.9
Other	0.0	0.0
NET OTHER COMPREHENSIVE INCOME	0.5	4.0
COMPREHENSIVE LOSS	(11.0)	12.7
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(11.0)	12.7
Pride International, Inc. [Member]
NET LOSS	(6.9)	7.6
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 INCOME	0.0	0.0
COMPREHENSIVE LOSS	(6.9)	7.6
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(6.9)	7.6
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET LOSS	(87.6)	50.4
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	(0.1)	0.5
NET OTHER COMPREHENSIVE INCOME	(0.1)	0.5
COMPREHENSIVE LOSS	(87.7)	50.9
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.4	(1.1)
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(87.3)	49.8
Consolidating Adjustments [Member]
NET LOSS	105.6	(65.6)
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 INCOME	0.0	0.0
COMPREHENSIVE LOSS	105.6	(65.6)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	$ 105.6	$ (65.6)

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