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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes        
Effective tax rate (as a percent) 25.50% 22.60% 25.50% 22.50%
Income tax at U.S. federal statutory tax rate (as a percent) 21.00% 21.00% 21.00% 21.00%