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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
At March 31, 2024, the Company had gross uncertain tax benefits of $244.1 million, of which $195.1 million, if recognized, would impact the effective tax rate.
The following is a reconciliation of the liability for uncertain tax positions (in millions):
Balance at December 31, 2023$233.5 
Additions for tax positions10.6 
Reductions for tax positions— 
Balance at March 31, 2024$244.1 
The additions above primarily reflect the tax positions for foreign tax planning initiatives. The Company recognizes interest and penalties accrued related to uncertain tax positions in income tax expense. The amounts recognized in income tax expense for interest and penalties during the three months ended March 31, 2024 and 2023 were not significant.
The effective tax rate for the three months ended March 31, 2024 was 18.5%, compared with 19.5% for the three months ended March 31, 2023. The lower effective tax rate in the first quarter of 2024 is primarily due to lower foreign and state taxes compared to the first quarter of 2023.