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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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