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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
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Loss from continuing operations attributable to Ensco | $ (145.0) | $ (25.2) | $ (428.0) | $ (96.2)
Income from continuing operations allocated to non-vested share awards(1) | (0.2) | (0.1) | (0.4) | (0.3)
Loss from continuing operations attributable to Ensco shares | $ (145.2) | $ (25.3) | $ (428.4) | $ (96.5)

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