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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
NET LOSS	$ (214.0)	$ (197.5)	$ 407.3	$ (188.0)	$ (203.1)	$ (142.9)	$ (150.1)	$ (140.5)	$ (192.2)	$ (636.6)	$ (304.2)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									(21.7)	0.0	0.0
Net change in fair value of derivatives									1.6	(9.7)	8.5
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									8.3	(1.0)	0.4
Other									(0.2)	(0.5)	0.7
NET OTHER COMPREHENSIVE INCOME (LOSS)									(12.0)	(11.2)	9.6
COMPREHENSIVE LOSS									(204.2)	(647.8)	(294.6)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(5.8)	(3.1)	0.5
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									(210.0)	(650.9)	(294.1)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
NET LOSS									(198.0)	(639.7)	(303.7)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									0.0
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									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 LOSS									(198.0)	(639.7)	(303.7)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									(198.0)	(639.7)	(303.7)
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
NET LOSS									(27.0)	(55.6)	(79.2)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									0.0
Net change in fair value of derivatives									1.6	(9.7)	8.5
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									8.3	(1.0)	0.4
Other									0.0	0.0	0.0
NET OTHER COMPREHENSIVE INCOME (LOSS)									9.9	(10.7)	8.9
COMPREHENSIVE LOSS									(17.1)	(66.3)	(70.3)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									(17.1)	(66.3)	(70.3)
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
NET LOSS									(55.8)	4.3	12.5
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									0.0
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									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 LOSS									(55.8)	4.3	12.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									(55.8)	4.3	12.5
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
NET LOSS									(666.0)	(352.6)	11.1
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									(21.7)
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									0.0	0.0	0.0
Other									(0.2)	(0.5)	0.7
NET OTHER COMPREHENSIVE INCOME (LOSS)									(21.9)	(0.5)	0.7
COMPREHENSIVE LOSS									(687.9)	(353.1)	11.8
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(5.8)	(3.1)	0.5
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									(693.7)	(356.2)	12.3
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
NET LOSS									754.6	407.0	55.1
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits									0.0
Net change in fair value of derivatives									0.0	0.0	0.0
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net loss									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 LOSS									754.6	407.0	55.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS									$ 754.6	$ 407.0	$ 55.1

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