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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
NET LOSS	$ (4,857.6)	$ (192.2)	$ (636.6)
OTHER COMPREHENSIVE INCOME (LOSS), NET
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(76.3)	(21.7)	0.0
Other Comprehensive Income (Loss), Defined Benefit Plan Settlement Gain (Loss), net of Tax	(0.2)	0.0	0.0
Net change in fair value of derivatives	(5.4)	1.6	(9.7)
Reclassification of net (gains) losses on derivative instruments from other comprehensive loss into net loss	(11.6)	8.3	(1.0)
Other	(0.6)	(0.2)	(0.5)
NET OTHER COMPREHENSIVE INCOME (LOSS)	(94.1)	(12.0)	(11.2)
COMPREHENSIVE LOSS	(4,951.7)	(204.2)	(647.8)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	2.1	(5.8)	(3.1)
COMPREHENSIVE LOSS ATTRIBUTABLE TO VALARIS	$ (4,949.6)	$ (210.0)	$ (650.9)

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