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Income Taxes
 9 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Income Taxes
7.
Income Taxes

The Company's effective income tax rate reflects the effect of federal and state income taxes on earnings and the impact of differences in book and tax accounting arising primarily from the permanent tax benefits associated with the statutory depletion deduction for mineral reserves. The effective income tax rates for continuing operations were 20.0% and 24.3% for the nine months ended September 30, 2025 and 2024, respectively. The higher 2024 effective income tax rate versus 2025 was driven by the impact of the February 2024 divestiture of the South Texas cement business and certain related ready mixed concrete operations, which reflected the write off of certain nondeductible goodwill and was treated as a discrete tax event.

The Company invests in renewable energy investment entities which qualify for tax credits and other tax benefits (RETC projects) and are accounted for under the proportional amortization method. For the nine months ended September 30, 2025, the Company's annualized effective tax rate included the proportional amortization of these investments of $128 million, offset by $124 million of tax credits and $15 million of other tax benefits. The proportional amortization and related tax credits and benefits for the nine months ended September 30, 2024 were immaterial.

During the nine months ended September 30, 2025, the Company has committed to equity contributions of $134 million for tax equity investments related to RETC projects. Of this total commitment, $125 million is expected to be paid within the next twelve months and is recorded in Accrued investments in limited liability companies on the consolidated balance sheet.

The Internal Revenue Service provided certain disaster tax relief for North Carolina businesses affected by Hurricanes Debby and Helene, which allowed the Company to defer estimated federal and certain state income, payroll and excise tax payments for the period from August 2024 through September 2025. The deferred obligation was paid on September 25, 2025.

On July 4, 2025, President Trump signed the One Big Beautiful Bill Act (OBBBA) that, among other provisions, makes 100% bonus depreciation permanent, restores the ability to expense domestic research expenditures, and modifies the taxation of foreign earnings. The OBBBA is not expected to have a material impact on the Company’s annual estimated income tax rate, but results in a reclassification between current taxes payable and deferred tax liabilities which is reflected in the period ended September 30, 2025.