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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Valaris	$ (1,107.4)	$ 405.5	$ (4,113.7)	$ 215.1
Income from continuing operations allocated to non-vested share awards	0.0	(12.1)	0.0	(6.3)
Income (loss) from continuing operations attributable to Valaris shares	$ (1,107.4)	$ 393.4	$ (4,113.7)	$ 208.8

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