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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Guarantor Obligations [Line Items]
Revenues	$ 551.3	$ 430.9	$ 1,541.1	$ 1,306.4
Contract drilling (exclusive of depreciation)	496.5	327.1	1,329.4	996.6
Loss on impairment	88.2	0.0	90.7	0.0
Depreciation	163.0	120.6	445.9	356.5
General and administrative	36.1	25.1	146.9	79.1
Total operating expenses	783.8	472.8	2,012.9	1,432.2
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	(3.7)	0.0	(3.1)	0.0
Operating Income (Loss)	(236.2)	(41.9)	(474.9)	(125.8)
OTHER INCOME (EXPENSE), NET	40.2	(77.7)	562.3	(233.2)
LOSS BEFORE INCOME TAXES	(196.0)	(119.6)	87.4	(359.0)
INCOME TAX PROVISION	1.5	23.3	65.6	66.4
Equity in Earnings of Subsidiaries Net of Tax	0.0		0.0
DISCONTINUED OPERATIONS, NET			0.0	(8.1)
NET LOSS	(197.5)	(142.9)	21.8	(433.5)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.4	(2.1)	(3.8)	(2.6)
NET LOSS ATTRIBUTABLE TO VALARIS	(197.1)	(145.0)	18.0	(436.1)
Valaris plc
Guarantor Obligations [Line Items]
Revenues	15.7	12.1	47.0	36.7
Contract drilling (exclusive of depreciation)	19.3	15.2	49.3	41.6
Depreciation	0.0	0.0	0.0	0.0
General and administrative	9.7	10.5	71.0	31.0
Total operating expenses	29.0		120.3
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		(130.8)		(400.1)
Operating Income (Loss)	(13.3)	(13.6)	(73.3)	(35.9)
OTHER INCOME (EXPENSE), NET	94.7	(0.6)	773.5	(0.1)
LOSS BEFORE INCOME TAXES	81.4	(14.2)	700.2	(36.0)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	(278.5)		(682.2)
DISCONTINUED OPERATIONS, NET				0.0
NET LOSS	(197.1)	(145.0)	18.0	(436.1)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO VALARIS	(197.1)	(145.0)	18.0	(436.1)
ENSCO International Incorporated
Guarantor Obligations [Line Items]
Revenues	53.0	40.7	128.6	120.8
Contract drilling (exclusive of depreciation)	45.3	36.4	112.8	109.2
Depreciation	7.7	3.6	15.4	10.6
General and administrative	0.1	1.9	0.3	2.2
Total operating expenses	53.1		128.5
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		28.2		77.7
Operating Income (Loss)	(0.1)	(1.2)	0.1	(1.2)
OTHER INCOME (EXPENSE), NET	(5.6)	(32.6)	(36.6)	(101.1)
LOSS BEFORE INCOME TAXES	(5.7)	(33.8)	(36.5)	(102.3)
INCOME TAX PROVISION	(18.4)	9.5	10.6	32.4
Equity in Earnings of Subsidiaries Net of Tax	(40.2)		35.1
DISCONTINUED OPERATIONS, NET				0.0
NET LOSS	(27.5)	(15.1)	(12.0)	(57.0)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO VALARIS	(27.5)	(15.1)	(12.0)	(57.0)
Pride International LLC
Guarantor Obligations [Line Items]
Revenues	0.0	0.0	0.0	0.0
Contract drilling (exclusive of depreciation)	0.0	0.0	0.0	0.0
Depreciation	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
Total operating expenses	0.0		0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		23.1		69.1
Operating Income (Loss)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	(20.2)	(19.5)	(61.0)	(69.5)
LOSS BEFORE INCOME TAXES	(20.2)	(19.5)	(61.0)	(69.5)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	(68.0)		(14.9)
DISCONTINUED OPERATIONS, NET				0.0
NET LOSS	(88.2)	3.6	(75.9)	(0.4)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO VALARIS	(88.2)	3.6	(75.9)	(0.4)
Other Non-Guarantor Subsidiaries of Valaris
Guarantor Obligations [Line Items]
Revenues	588.8	459.2	1,627.1	1,387.0
Contract drilling (exclusive of depreciation)	538.1	356.6	1,428.9	1,083.9
Loss on impairment	88.2		90.7
Depreciation	155.3	117.0	430.5	345.9
General and administrative	26.3	12.7	75.6	45.9
Total operating expenses	807.9		2,025.7
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	(3.7)	0.0	(3.1)	0.0
Operating Income (Loss)	(222.8)	(27.1)	(401.7)	(88.7)
OTHER INCOME (EXPENSE), NET	(33.0)	(29.0)	(126.3)	(85.9)
LOSS BEFORE INCOME TAXES	(255.8)	(56.1)	(528.0)	(174.6)
INCOME TAX PROVISION	19.9	13.8	55.0	34.0
Equity in Earnings of Subsidiaries Net of Tax	0.0		0.0
DISCONTINUED OPERATIONS, NET				(8.1)
NET LOSS	(275.7)	(69.9)	(583.0)	(216.7)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.4	(2.1)	(3.8)	(2.6)
NET LOSS ATTRIBUTABLE TO VALARIS	(275.3)	(72.0)	(586.8)	(219.3)
Consolidating Adjustments
Guarantor Obligations [Line Items]
Revenues	(106.2)	(81.1)	(261.6)	(238.1)
Contract drilling (exclusive of depreciation)	(106.2)	(81.1)	(261.6)	(238.1)
Depreciation	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
Total operating expenses	(106.2)		(261.6)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		79.5		253.3
Operating Income (Loss)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	4.3	4.0	12.7	23.4
LOSS BEFORE INCOME TAXES	4.3	4.0	12.7	23.4
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	386.7		662.0
DISCONTINUED OPERATIONS, NET				0.0
NET LOSS	391.0	83.5	674.7	276.7
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO VALARIS	$ 391.0	$ 83.5	$ 674.7	$ 276.7

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