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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Valaris) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
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Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |
Income (loss) from continuing operations attributable to Ensco | $ (4,467.0) | $ (33.0) | $ (4,855.5) | $ (198.0)
Income from continuing operations allocated to non-vested share awards | 0.0 | 0.0 | 0.0 | (0.1)
Income (loss) from continuing operations attributable to Ensco shares | $ (4,467.0) | $ (33.0) | $ (4,855.5) | $ (198.1)

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