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Income Taxes
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
At June 30, 2021, the Company had gross uncertain tax benefits of $132.3 million, of which $81.4 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, 2020$100.7 
Additions for tax positions32.4 
Reductions for tax positions(0.8)
Balance at June 30, 2021$132.3 
The additions above primarily reflect the tax positions included as a component of goodwill for businesses recently acquired. 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 and six months ended June 30, 2021 and 2020 were not significant.
The effective tax rate for the three months ended June 30, 2021 was 20.6%, compared with 19.5% for the three months ended June 30, 2020.