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Description Of The Business And Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Reconciliation Of Net Income Attributable To Valaris Shares Used In Basic And Diluted EPS Computations | The following table is a reconciliation of the weighted-average shares used in our basic and diluted EPS computations for the years ended December 31, 2023 and 2022, eight months ended December 31, 2021 (Successor), and four months ended April 30, 2021 (Predecessor) (in millions):
| Successor |  |  | Predecessor
| Year Ended December 31, 2023 |  | Year Ended December 31, 2022 |  | Eight Months Ended December 31, 2021 |  |  | Four Months Ended April 30, 2021
Income (loss) attributable to our shares | $ | 865.4 |  |  | $ | 176.5 |  |  | $ | (27.4) |  |  |  | $ | (4,467.0) |
Weighted average shares outstanding: |  |  |  |  |  |  |  |
Basic | 74.1 |  |  | 75.1 |  |  | 75.0 |  |  |  | 199.6 |
Effect of stock equivalents | 1.1 |  |  | 0.5 |  |  | — |  |  |  | — |
Diluted | 75.2 |  |  | 75.6 |  |  | 75.0 |  |  |  | 199.6 |

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