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Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 551.3	$ 430.9	$ 1,541.1	$ 1,306.4
OPERATING EXPENSES
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 IN EARNINGS OF ARO	(3.7)	0.0	(3.1)	0.0
OPERATING LOSS	(236.2)	(41.9)	(474.9)	(125.8)
OTHER INCOME (EXPENSE)
Interest income	6.7	3.6	22.1	10.5
Interest expense, net	(113.9)	(72.2)	(313.2)	(213.5)
Other, net	147.4	(9.1)	853.4	(30.2)
Other income (expense), net	40.2	(77.7)	562.3	(233.2)
LOSS BEFORE INCOME TAXES	(196.0)	(119.6)	87.4	(359.0)
PROVISION FOR INCOME TAXES
Current income tax expense (benefit)	22.6	(5.7)	69.4	21.5
Deferred income tax expense (benefit)	(21.1)	29.0	(3.8)	44.9
Total provision for income taxes	1.5	23.3	65.6	66.4
LOSS FROM CONTINUING OPERATIONS			21.8	(425.4)
LOSS FROM DISCONTINUED OPERATIONS, NET			0.0	(8.1)
NET LOSS	(197.5)	(142.9)	21.8	(433.5)
NET (INCOME) LOSS 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)
LOSS PER SHARE - BASIC AND DILUTED
Continuing operations (in dollars per share)			$ 0.10	$ (3.94)
Discontinued operations (in dollars per share)			0	(0.08)
Basic and diluted (in dollars per share)	$ (1.00)	$ (1.34)	$ 0.10	$ (4.02)
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic and Diluted (in shares)	197.6	108.6	165.2	108.5

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