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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The effective income tax rate of 15.9% for the first quarter of 2024 reflects a 1.6 percentage point unfavorable discrete impact of a charge for the acquisition of Harpoon for which no tax benefit was recognized. The effective income tax rate of 22.6% for the first quarter of 2023 reflects a 5.5 percentage point unfavorable discrete impact of a charge for the acquisition of Imago for which no tax benefit was recognized.
The Internal Revenue Service (IRS) is currently conducting examinations of the Company’s tax returns for the years 2017 and 2018, including the one-time transition tax enacted under the Tax Cuts and Jobs Act of 2017. If the IRS disagrees with the Company’s transition tax position, it may result in a significant tax liability. The statute of limitations for assessments with respect to the 2019 and 2020 federal return years will expire in June and October of 2024, respectively, unless extended.