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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Our effective tax rate was 19% and 21% during the three months ended March 31, 2024 and 2023, respectively. The effective tax rate for the three months ended March 31, 2024 was lower than the effective tax rate for the comparable period in 2023 primarily due to deferred income tax benefits from state apportionment changes in the current period, partially offset by the U.K. corporate income tax rate increase to 25% effective for the full year in 2024, the net effect of which was greater than the impact of favorable audit settlements for certain historical periods during the three months ended March 31, 2023.
The Organisation for Economic Cooperation and Development, or OECD, Global Anti-Base Erosion Pillar Two minimum tax rules, or Pillar Two, which generally provide for a minimum effective tax rate of 15%, are intended to apply to tax years beginning in 2024. The EU member states and many other countries, including the U.K., our most significant non-U.S. jurisdiction, have committed to implement or have already enacted legislation adopting the Pillar Two rules. In July 2023, the U.K. enacted the U.K. Finance Act 2023, effective as of January 1, 2024, which includes provisions to implement certain portions of the Pillar Two minimum tax rules and includes an election to apply a transitional safe harbor to extend certain effective dates to accounting periods ending on or before June 30, 2028. These new U.K. Pillar Two rules did not have a material impact on our income tax provision as of March 31, 2024.