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Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
NET (LOSS) INCOME	$ (44.3)	$ 592.6	$ (68.9)	$ 769.3
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	2.9	(4.1)	6.0	(0.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.3	2.0	1.2	7.9
Other	0.2	0.1	0.7	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	3.4	(2.0)	7.9	7.3
COMPREHENSIVE (LOSS) INCOME	(40.9)	590.6	(61.0)	776.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.2)	(2.0)	(2.3)	(3.4)
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(42.1)	588.6	(63.3)	773.2
Ensco Plc [Member]
NET (LOSS) INCOME	(45.5)	590.6	(71.2)	765.9
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	(45.5)	590.6	(71.2)	765.9
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(45.5)	590.6	(71.2)	765.9
ENSCO International Inc. [Member]
NET (LOSS) INCOME	(8.5)	23.0	0.2	22.6
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	2.9	(4.1)	6.0	(0.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.3	2.0	1.2	7.9
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	3.2	(2.1)	7.2	7.3
COMPREHENSIVE (LOSS) INCOME	(5.3)	20.9	7.4	29.9
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(5.3)	20.9	7.4	29.9
Pride International, Inc. [Member]
NET (LOSS) INCOME	3.0	(8.6)	10.6	25.9
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	3.0	(8.6)	10.6	25.9
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	3.0	(8.6)	10.6	25.9
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET (LOSS) INCOME	24.7	382.3	75.1	655.0
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other	0.2	0.1	0.7	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.2	0.1	0.7	0.0
COMPREHENSIVE (LOSS) INCOME	24.9	382.4	75.8	655.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.2)	(2.0)	(2.3)	(3.4)
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	23.7	380.4	73.5	651.6
Consolidating Adjustments [Member]
NET (LOSS) INCOME	(18.0)	(394.7)	(83.6)	(700.1)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	0.0	0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.0	0.0	0.0	0.0
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	(18.0)	(394.7)	(83.6)	(700.1)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	$ (18.0)	$ (394.7)	$ (83.6)	$ (700.1)

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