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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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