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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Guarantor Obligations [Line Items]
Revenues	$ 583.9	$ 458.5	$ 989.8	$ 875.5
Contract drilling (exclusive of depreciation)	500.3	344.3	832.9	669.5
Asset Impairment Charges	2.5	0.0	2.5	0.0
Depreciation expense	157.9	120.7	282.9	235.9
General and administrative	81.2	26.1	110.8	54.0
Costs and Expenses	741.9	491.1	1,229.1	959.4
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0.6	0.0	0.6	0.0
Operating Income (Loss)	(157.4)	(32.6)	(238.7)	(83.9)
OTHER INCOME (EXPENSE), NET	597.3	(84.8)	522.1	(155.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	439.9	(117.4)	283.4	(239.4)
INCOME TAX PROVISION	32.6	24.7	64.1	43.1
Equity in Earnings of Subsidiaries Net of Tax	0.0		0.0
DISCONTINUED OPERATIONS, NET	0.0	(8.0)	0.0	(8.1)
NET INCOME (LOSS)	407.3	(150.1)	219.3	(290.6)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.8)	(0.9)	(4.2)	(0.5)
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	405.5	(151.0)	215.1	(291.1)
Valaris plc
Guarantor Obligations [Line Items]
Revenues	19.9	12.3	31.3	24.6
Contract drilling (exclusive of depreciation)	18.3	13.0	30.0	26.4
Depreciation expense	0.0	0.0	0.0	0.0
General and administrative	46.4	10.3	61.3	20.5
Costs and Expenses	64.7		91.3
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		(134.9)		(269.3)
Operating Income (Loss)	(44.8)	(11.0)	(60.0)	(22.3)
OTHER INCOME (EXPENSE), NET	694.9	(5.1)	678.8	0.5
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	650.1	(16.1)	618.8	(21.8)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	(244.6)		(403.7)
DISCONTINUED OPERATIONS, NET		0.0		0.0
NET INCOME (LOSS)	405.5	(151.0)	215.1	(291.1)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	405.5	(151.0)	215.1	(291.1)
ENSCO International Incorporated
Guarantor Obligations [Line Items]
Revenues	36.1	39.8	75.6	80.1
Contract drilling (exclusive of depreciation)	31.8	36.2	67.5	72.8
Depreciation expense	4.0	3.5	7.7	7.0
General and administrative	0.1	0.1	0.2	0.3
Costs and Expenses	35.9		75.4
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		28.7		49.5
Operating Income (Loss)	0.2	0.0	0.2	0.0
OTHER INCOME (EXPENSE), NET	(15.6)	(40.5)	(31.0)	(68.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(15.4)	(40.5)	(30.8)	(68.5)
INCOME TAX PROVISION	12.4	18.6	29.0	22.9
Equity in Earnings of Subsidiaries Net of Tax	43.2		75.3
DISCONTINUED OPERATIONS, NET		0.0		0.0
NET INCOME (LOSS)	15.4	(30.4)	15.5	(41.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	15.4	(30.4)	15.5	(41.9)
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 expense	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
Costs and Expenses	0.0		0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		22.6		46.0
Operating Income (Loss)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	(20.3)	(19.7)	(40.8)	(50.0)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(20.3)	(19.7)	(40.8)	(50.0)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	27.0		53.1
DISCONTINUED OPERATIONS, NET		0.0		0.0
NET INCOME (LOSS)	6.7	2.9	12.3	(4.0)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	6.7	2.9	12.3	(4.0)
Other Non-Guarantor Subsidiaries of Valaris
Guarantor Obligations [Line Items]
Revenues	607.9	484.3	1,038.3	927.8
Contract drilling (exclusive of depreciation)	530.2	373.0	890.8	727.3
Asset Impairment Charges	2.5		2.5
Depreciation expense	153.9	117.2	275.2	228.9
General and administrative	34.7	15.7	49.3	33.2
Costs and Expenses	721.3		1,217.8
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0.6	0.0	0.6	0.0
Operating Income (Loss)	(112.8)	(21.6)	(178.9)	(61.6)
OTHER INCOME (EXPENSE), NET	(66.0)	(23.5)	(93.3)	(56.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(178.8)	(45.1)	(272.2)	(118.5)
INCOME TAX PROVISION	20.2	6.1	35.1	20.2
Equity in Earnings of Subsidiaries Net of Tax	0.0		0.0
DISCONTINUED OPERATIONS, NET		(8.0)		(8.1)
NET INCOME (LOSS)	(199.0)	(59.2)	(307.3)	(146.8)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.8)	(0.9)	(4.2)	(0.5)
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	(200.8)	(60.1)	(311.5)	(147.3)
Consolidating Adjustments
Guarantor Obligations [Line Items]
Revenues	(80.0)	(77.9)	(155.4)	(157.0)
Contract drilling (exclusive of depreciation)	(80.0)	(77.9)	(155.4)	(157.0)
Depreciation expense	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
Costs and Expenses	(80.0)		(155.4)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX		83.6		173.8
Operating Income (Loss)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	4.3	4.0	8.4	19.4
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	4.3	4.0	8.4	19.4
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
Equity in Earnings of Subsidiaries Net of Tax	174.4		275.3
DISCONTINUED OPERATIONS, NET		0.0		0.0
NET INCOME (LOSS)	178.7	87.6	283.7	193.2
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	$ 178.7	$ 87.6	$ 283.7	$ 193.2

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