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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Valaris	$ 405.5	$ (143.0)	$ 215.1	$ (283.0)
Income from continuing operations allocated to non-vested share awards	(12.1)	(0.1)	(6.3)	(0.2)
Income (loss) from continuing operations attributable to Valaris shares	$ 393.4	$ (143.1)	$ 208.8	$ (283.2)

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

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