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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
NET INCOME (LOSS)	$ 40.5	$ 87.3	$ 592.6	$ 176.7	$ (2,470.3)	$ 293.8	$ 262.7	$ 327.9	$ 897.1	$ (1,585.9)	$ (3,888.5)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(5.4)	(23.6)	(11.7)
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									12.4	22.2	(0.9)
Other									(0.5)	2.0	6.3
NET OTHER COMPREHENSIVE INCOME (LOSS)									6.5	0.6	(6.3)
COMPREHENSIVE INCOME (LOSS)									903.6	(1,585.3)	(3,894.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(6.9)	(8.9)	(14.1)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									896.7	(1,594.2)	(3,908.9)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									890.2	(1,594.8)	(3,902.6)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									890.2	(1,594.8)	(3,902.6)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									890.2	(1,594.8)	(3,902.6)
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									108.2	(1,524.8)	(3,657.4)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(5.4)	(23.6)	(11.7)
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									12.4	22.2	(0.9)
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									7.0	(1.4)	(12.6)
COMPREHENSIVE INCOME (LOSS)									115.2	(1,526.2)	(3,670.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									115.2	(1,526.2)	(3,670.0)
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									49.2	(1,843.0)	(3,799.0)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									49.2	(1,843.0)	(3,799.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									49.2	(1,843.0)	(3,799.0)
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									890.7	(1,443.8)	(3,710.9)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									0.0	0.0	0.0
Other									(0.5)	2.0	6.3
NET OTHER COMPREHENSIVE INCOME (LOSS)									(0.5)	2.0	6.3
COMPREHENSIVE INCOME (LOSS)									890.2	(1,441.8)	(3,704.6)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(6.9)	(8.9)	(14.1)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									883.3	(1,450.7)	(3,718.7)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET INCOME (LOSS)									(1,041.2)	4,820.5	11,181.4
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income									0.0	0.0	0.0
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS)									(1,041.2)	4,820.5	11,181.4
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ (1,041.2)	$ 4,820.5	$ 11,181.4

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