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Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ (1,108.8)	$ 407.3	$ (4,116.5)	$ 219.3
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in derivative fair value	4.8	(1.6)	(8.1)	(1.6)
Reclassification of net (gains) losses on derivative instruments from other comprehensive income (loss) into net income (loss)	(10.9)	1.8	(11.0)	3.4
Other			(0.4)	(0.1)
NET OTHER COMPREHENSIVE INCOME (LOSS)	(6.1)	0.2	(19.5)	1.7
COMPREHENSIVE INCOME (LOSS)	(1,114.9)	407.5	(4,136.0)	221.0
COMPREHENSIVE (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1.4	(1.8)	2.8	(4.2)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO VALARIS	$ (1,113.5)	$ 405.7	$ (4,133.2)	$ 216.8

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