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Income Taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
Our provision for income taxes as a percentage of pretax earnings is based on a current estimate of the annual effective income tax rate adjusted to reflect the impact of discrete items.

During the three and six months ended June 30, 2021, our effective tax rate was 19.4% and 21.7%, respectively. Each rate was favorably impacted by recognition of a windfall tax benefit from equity vesting. During the three and six months ended June 30, 2020, our effective tax rate was 26.5% and 26.4%, respectively. Each rate was unfavorably impacted by recognition of a shortfall tax from equity vesting.