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Income Taxes
 9 Months Ended
Sep. 30, 2024
Income Taxes [Abstract]  
Income Taxes
10.
Income Taxes

The effective income tax rates for the three months ended September 30, 2024 and 2023 were 23.7% and 17.5%, respectively. For the nine months ended September 30, 2024 and 2023, the effective income tax rates were 25.7% and 22.7%, respectively. The effective tax rates for the three and nine months ended September 30, 2024 and 2023, were impacted by changes in estimates associated with the finalization of prior year foreign tax items and the mix of foreign earnings. The effective tax rates for both the three and nine months ended September 30, 2024, were also impacted by the limited tax deductibility of costs related to the Portfolio Optimization Plan. The effective tax rates for both the three and nine months ended September 30, 2023, were also impacted by changes in valuation allowances.