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Income Taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
 
Income tax expense is provided on an interim basis based upon our estimate of the annual effective income tax rate, adjusted each quarter for discrete items. For the three months ended June 30, 2021 and 2020, our effective tax rate was 20.9% and 20.0%, respectively, and for the six months ended June 30, 2021 and 2020, our effective tax rate was 20.7% and 20.9%, respectively. Impacting our effective tax rate in the second quarter of 2020 was the reversal of a valuation allowance generated in the first quarter of 2020 by the financial market volatility resulting from the COVID-19 pandemic, which decreased our effective tax rate by 0.9%.