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Unaudited Quarterly Financial Data (Summary Of Unaudited Quarterly Consolidated Income Statement) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data [Abstract]
Revenues	$ 512.1	$ 551.3	$ 583.9	$ 405.9	$ 399.0	$ 430.9	$ 458.5	$ 417.0	$ 2,053.2	$ 1,705.4	$ 1,843.0
Cost of Goods and Services Sold	476.6	496.5	500.3	332.6	322.8	327.1	344.3	325.2	1,806.0	1,319.4	1,189.5
Loss on impairment	13.3	88.2	2.5	0.0	40.3	0.0	0.0	0.0	104.0	40.3	182.9
Depreciation expense	163.8	163.0	157.9	125.0	122.4	120.6	120.7	115.2	609.7	478.9	444.8
General and administrative	42.0	36.1	81.2	29.6	23.6	25.1	26.1	27.9	188.9	102.7	157.8
EQUITY IN EARNINGS OF ARO	(9.5)	(3.7)	0.6	0.0					(12.6)	0.0	0.0
OPERATING LOSS	(193.1)	(236.2)	(157.4)	(81.3)	(110.1)	(41.9)	(32.6)	(51.3)	(668.0)	(235.9)	(132.0)
Other income (expense), net	41.9	40.2	597.3	(75.2)	(69.8)	(77.7)	(84.8)	(70.7)	604.2	(303.0)	(64.0)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(151.2)	(196.0)	439.9	(156.5)	(179.9)	(119.6)	(117.4)	(122.0)	(63.8)	(538.9)	(196.0)
Provision for income taxes	62.8	1.5	32.6	31.5	23.2	23.3	24.7	18.4	128.4	89.6	109.2
LOSS FROM CONTINUING OPERATIONS					(203.1)	(142.9)	(142.1)	(140.4)	(192.2)	(628.5)	(305.2)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET					0.0	0.0	(8.0)	(0.1)	0.0	(8.1)	1.0
NET LOSS	(214.0)	(197.5)	407.3	(188.0)	(203.1)	(142.9)	(150.1)	(140.5)	(192.2)	(636.6)	(304.2)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.0)	0.4	(1.8)	(2.4)	(0.5)	(2.1)	(0.9)	0.4	(5.8)	(3.1)	0.5
NET LOSS ATTRIBUTABLE TO VALARIS	$ (216.0)	$ (197.1)	$ 405.5	$ (190.4)	$ (203.6)	$ (145.0)	$ (151.0)	$ (140.1)	$ (198.0)	$ (639.7)	$ (303.7)
Income (loss) per share – basic and diluted
Continuing operations	$ (1.09)	$ (1.00)	$ 2.09	$ (1.75)	$ (1.88)	$ (1.34)	$ (1.31)	$ (1.29)	$ (1.14)	$ (5.82)	$ (3.66)
Discontinued operations	0	0	0	0	0	0	(0.08)	0	0	(0.08)	0
Total earnings per share - basic	$ (1.09)	$ (1.00)	$ 2.09	$ (1.75)	$ (1.88)	$ (1.34)	$ (1.39)	$ (1.29)	$ (1.14)	$ (5.90)	$ (3.66)

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