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Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
NET LOSS	$ (142.9)	$ (28.2)	$ (433.5)	$ (97.1)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	(1.9)	1.7	(6.8)	7.7
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.7	(0.1)	(2.2)	1.1
Other	(0.1)	0.1	(0.4)	0.8
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1.3)	1.7	(9.4)	9.6
COMPREHENSIVE LOSS	(144.2)	(26.5)	(442.9)	(87.5)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.1)	2.8	(2.6)	0.5
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(146.3)	(23.7)	(445.5)	(87.0)
Ensco plc
NET LOSS	(145.0)	(25.4)	(436.1)	(96.6)
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	(145.0)	(25.4)	(436.1)	(96.6)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(145.0)	(25.4)	(436.1)	(96.6)
ENSCO International Incorporated
NET LOSS	(15.1)	(14.6)	(57.0)	(14.4)
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	(1.9)	1.7	(6.8)	7.7
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0.7	(0.1)	(2.2)	1.1
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)	(1.2)	1.6	(9.0)	8.8
COMPREHENSIVE LOSS	(16.3)	(13.0)	(66.0)	(5.6)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(16.3)	(13.0)	(66.0)	(5.6)
Pride International LLC
NET LOSS	3.6	5.8	(0.4)	16.4
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	3.6	5.8	(0.4)	16.4
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	3.6	5.8	(0.4)	16.4
Other Non-Guarantor Subsidiaries of Ensco
NET LOSS	(69.9)	36.3	(216.7)	111.4
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	(0.1)	0.1	(0.4)	0.8
NET OTHER COMPREHENSIVE INCOME (LOSS)	(0.1)	0.1	(0.4)	0.8
COMPREHENSIVE LOSS	(70.0)	36.4	(217.1)	112.2
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.1)	2.8	(2.6)	0.5
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	(72.1)	39.2	(219.7)	112.7
Consolidating Adjustments
NET LOSS	83.5	(30.3)	276.7	(113.9)
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	83.5	(30.3)	276.7	(113.9)
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO ENSCO	$ 83.5	$ (30.3)	$ 276.7	$ (113.9)

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