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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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