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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
NET (LOSS) INCOME	$ (28.2)	$ 87.3	$ (97.1)	$ 856.6
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	1.7	0.0	7.7	(0.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(0.1)	2.2	1.1	10.1
Other	0.1	(0.5)	0.8	(0.5)
NET OTHER COMPREHENSIVE INCOME	1.7	1.7	9.6	9.0
COMPREHENSIVE (LOSS) INCOME	(26.5)	89.0	(87.5)	865.6
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	2.8	(2.0)	0.5	(5.4)
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(23.7)	87.0	(87.0)	860.2
Ensco plc
NET (LOSS) INCOME	(25.4)	85.3	(96.6)	851.2
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	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	(25.4)	85.3	(96.6)	851.2
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(25.4)	85.3	(96.6)	851.2
ENSCO International Incorporated
NET (LOSS) INCOME	(14.6)	26.5	(14.4)	49.1
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in derivative fair value	1.7	0.0	7.7	(0.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	(0.1)	2.2	1.1	10.1
Other	0.0	0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME	1.6	2.2	8.8	9.5
COMPREHENSIVE (LOSS) INCOME	(13.0)	28.7	(5.6)	58.6
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	(13.0)	28.7	(5.6)	58.6
Pride International LLC
NET (LOSS) INCOME	5.8	4.9	16.4	30.8
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	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	5.8	4.9	16.4	30.8
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	5.8	4.9	16.4	30.8
Other Non-Guarantor Subsidiaries of Ensco
NET (LOSS) INCOME	36.3	135.7	111.4	790.7
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	(0.5)	0.8	(0.5)
NET OTHER COMPREHENSIVE INCOME	0.1	(0.5)	0.8	(0.5)
COMPREHENSIVE (LOSS) INCOME	36.4	135.2	112.2	790.2
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	2.8	(2.0)	0.5	(5.4)
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	39.2	133.2	112.7	784.8
Consolidating Adjustments
NET (LOSS) INCOME	(30.3)	(165.1)	(113.9)	(865.2)
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
NET OTHER COMPREHENSIVE INCOME	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME	(30.3)	(165.1)	(113.9)	(865.2)
COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO ENSCO	$ (30.3)	$ (165.1)	$ (113.9)	$ (865.2)

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