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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Valaris	$ (670.9)	$ (197.1)	$ (4,784.6)	$ 18.0
Income from continuing operations allocated to non-vested share awards	0.0	0.0	0.0	(0.6)
Income (loss) from continuing operations attributable to Valaris shares	$ (670.9)	$ (197.1)	$ (4,784.6)	$ 17.4

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