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Income Taxes
 9 Months Ended
Sep. 30, 2023
Income Taxes [Abstract]  
Income Taxes 8. Income Taxes

The effective income tax rate for the three months ended September 30, 2023, was 24.2%, a decrease from an effective income tax rate of 24.4% for the three months ended September 30, 2022. The decrease is primarily due to a decrease in uncertain tax position reserves and higher income tax credits, mostly offset by a decrease in tax benefits from option exercises and equity vesting.

The effective income tax rate for the nine months ended September 30, 2023, was 23.5%, an increase from an effective income tax rate of 23.1% for the nine months ended September 30, 2022. The increase is primarily due to fewer tax benefits related to option exercises and equity vesting, partially offset by higher income tax credits.