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Income Taxes
 6 Months Ended
Jun. 30, 2022
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]  
Income Taxes Income Taxes
 
Valaris Limited is domiciled and resident in Bermuda. Our subsidiaries conduct operations and earn income in numerous countries and are subject to the laws of taxing jurisdictions within those countries. The income of our non-Bermuda subsidiaries is not subject to Bermuda taxation as there is not an income tax regime in Bermuda. Legacy Valaris was domiciled and resident in the U.K. The income of our non-U.K. subsidiaries was generally not subject to U.K. taxation.
Income tax rates and taxation systems in the jurisdictions in which our subsidiaries conduct operations vary and our subsidiaries are frequently subjected to minimum taxation regimes. In some jurisdictions, tax liabilities are based on gross revenues, statutory deemed profits or other factors, rather than on net income, and our subsidiaries are frequently unable to realize tax benefits when they operate at a loss. Accordingly, during periods of declining profitability, our income tax expense may not decline proportionally with income, which could result in higher effective income tax rates. Furthermore, we will continue to incur income tax expense in periods in which we operate at a loss.
    
Our drilling rigs frequently move from one taxing jurisdiction to another to perform contract drilling services. In some instances, the movement of drilling rigs among taxing jurisdictions will involve the transfer of ownership of the drilling rigs among our subsidiaries. As a result of frequent changes in the taxing jurisdictions in which our drilling rigs are operated and/or owned, changes in profitability levels and changes in tax laws, our annual effective income tax rate may vary substantially from one reporting period to another.

Historically, we calculated our provision for income taxes during interim reporting periods by applying the estimated annual effective tax rate for the full fiscal year to pre-tax income or loss, excluding discrete items, for the reporting period. We determined that since small changes in estimated pre-tax income or loss would result in significant changes in the estimated annual effective tax rate, the historical method would not provide a reliable estimate of income taxes for the three and six months ended June 30, 2022 (Successor), the two months ended June 30, 2021 (Successor), and the one month and four months ended April 30, 2021 (Predecessor). We used a discrete effective tax rate method to calculate income taxes for the three and six months ended June 30, 2022 (Successor), the two months ended June 30, 2021 (Successor), and the one month and four months ended April 30, 2021 (Predecessor). We will continue to evaluate income tax estimates under the historical method in subsequent quarters and employ a discrete effective tax rate method if warranted.

Discrete income tax expense for the three months ended June 30, 2022 (Successor) was $6.2 million and was primarily attributable to income associated with a contract termination. Discrete income tax benefit for the six months ended June 30, 2022 (Successor) was $8.3 million and was primarily attributable to changes in liabilities for unrecognized tax benefits associated with tax positions taken in prior years, partially offset by discrete tax expense attributable to income associated with a contract termination. Excluding the aforementioned discrete tax items, income tax expense for the three and six months ended June 30, 2022 (Successor) was $14.0 million and $27.8 million, respectively.

Discrete income tax expense for the two months ended June 30, 2021 (Successor) was $5.6 million and was primarily attributable to changes in liabilities for unrecognized tax benefits associated with tax positions taken in prior years and resolution of other prior period tax matters. Discrete income tax benefit for the one month ended April 30, 2021 (Predecessor) was $18.1 million and was primarily attributable to fresh start accounting adjustments. Discrete income tax expense for the four months ended April 30, 2021 (Predecessor) was $2.2 million and was primarily attributable to changes in liabilities for unrecognized tax benefits associated with tax positions taken in prior years and resolution of other prior period tax matters offset by discrete tax benefit related to fresh start accounting adjustments. Excluding the aforementioned discrete tax items, income tax expense for the two months ended June 30, 2021 (Successor), and the one month and four months ended April 30, 2021 (Predecessor) was $9.5 million, $2.6 million and $14.0 million, respectively.