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Income Tax Provision
 6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Income Tax Provision Income Tax Provision
We had an effective income tax rate of 13.9% and 16.1% for the three and six months ended June 30, 2024, respectively, compared to 12.5% and 15.5% for the three and six months ended June 30, 2023, respectively. The increase in the effective tax rate for the three and six months ended June 30, 2024, as compared to the prior period, is due to a decrease in research tax credits offset by a decrease in liabilities for uncertain tax positions and non-deductible business expenses and an increase in excess tax benefits related to stock incentive awards in the current year.
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 $39.1 million and $92.9 million in the six months ended June 30, 2024, and 2023, respectively.