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Income Tax Provision
 9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Income Tax Provision Income Tax Provision
We had an effective income tax rate of 11.8% and 14.5% for the three and nine months ended September 30, 2024, respectively, compared to 20.2% and 17.3% for the three and nine months ended September 30, 2023, respectively. The decrease in the effective tax rate for the three and nine months ended September 30, 2024, as compared to the prior period, is due to an increase in excess tax benefits related to stock incentive awards in the current year and lower non-deductible business expenses and liabilities for uncertain tax positions, partially offset by an increase in state taxes and lower research tax credit benefits.
The effective income tax rates for the periods presented are different from the statutory United States federal income tax rate of 21% primarily due to research tax credits and excess tax benefits related to stock incentive awards, offset by state income taxes, liabilities for uncertain tax positions, and non-deductible business expenses.
We made income tax payments, net of refunds, of $45.7 million and $118.0 million in the nine months ended September 30, 2024, and 2023, respectively.