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Income Taxes
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
At June 30, 2020, the Company had gross uncertain tax benefits of $117.6 million, of which $71.2 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, 2019$109.1  
Additions for tax positions10.1  
Reductions for tax positions(1.6) 
Balance at June 30, 2020$117.6  
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, 2020 and 2019 were not significant.
The effective tax rate for the three months ended June 30, 2020 was 19.5%, compared with 20.4% for the three months ended June 30, 2019. The effective tax rate for the six months ended June 30, 2020 was 19.9%, compared with 20.4% for the six months ended June 30, 2019. The lower rate for 2020 reflects the results of tax planning initiatives and lower mix-related foreign tax expense partially offset by lower year over year tax benefits related to share-based payment transactions.