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Earnings (Loss) Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Valaris	$ (197.1)	$ (145.0)	$ 18.0	$ (436.1)
Income from continuing operations allocated to non-vested share awards	0.0	(0.2)	(0.6)	(0.4)
Income (loss) from continuing operations attributable to Valaris shares	$ (197.1)	$ (145.2)	$ 17.4	$ (436.5)

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

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