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Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 583.9	$ 458.5	$ 989.8	$ 875.5
OPERATING EXPENSES
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
Total operating expenses	741.9	491.1	1,229.1	959.4
Income (Loss) from Equity Method Investments	(0.6)	0.0	(0.6)	0.0
OPERATING LOSS	(157.4)	(32.6)	(238.7)	(83.9)
OTHER INCOME (EXPENSE)
Interest income	11.9	3.9	15.4	6.9
Interest expense, net	(118.3)	(75.7)	(199.3)	(141.3)
Other, net	703.7	(13.0)	706.0	(21.1)
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)
PROVISION FOR INCOME TAXES
Current income tax expense	21.2	20.1	46.8	27.2
Deferred income tax expense	11.4	4.6	17.3	15.9
Total provision for income taxes	32.6	24.7	64.1	43.1
INCOME (LOSS) FROM CONTINUING OPERATIONS	407.3	(142.1)	219.3	(282.5)
LOSS FROM 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)
EARNINGS (LOSS) PER SHARE - BASIC AND DILUTED
Continuing operations (in dollars per share)	$ 2.09	$ (1.31)	$ 1.40	$ (2.61)
Discontinued operations (in dollars per share)	0	(0.08)	0	(0.08)
(Loss) earnings per share - basic and diluted (in dollars per share)	$ 2.09	$ (1.39)	$ 1.40	$ (2.69)
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic and Diluted (in shares)	188.6	108.5	148.9	108.5

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