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Description Of The Business And Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Reconciliation Of Net Income Attributable To Ensco Shares Used In Basic And Diluted EPS Computations | The following table is a reconciliation of loss from continuing operations attributable to Valaris shares used in our basic and diluted EPS computations for each of the years in the three-year period ended December 31, 2019 (in millions):
| 2019 |  | 2018 |  | 2017
Loss from continuing operations attributable to Valaris | $ | (198.0 | ) |  | $ | (631.6 | ) |  | $ | (304.7 | )
Income from continuing operations allocated to non-vested share awards | (.1 | ) |  | (.5 | ) |  | (.4 | )
Loss from continuing operations attributable to Valaris shares | $ | (198.1 | ) |  | $ | (632.1 | ) |  | $ | (305.1 | )

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- Definition Reconciliation of Net Income Attributable to Ensco Shares Used in Basic and Diluted EPS Computations [Table Text Block] + References No definition available. + Details
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