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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Loss from continuing operations attributable to Valaris	$ (3,006.3)	$ (190.4)
Income from continuing operations allocated to non-vested share awards	0.0	(0.1)
Loss from continuing operations attributable to Valaris shares	$ (3,006.3)	$ (190.5)

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Amount of preferred stock dividends and adjustments classified as other.

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