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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        
Provision for income tax expense (as a percent) 19.70% 18.90% 19.40% 18.40%
Federal corporate income tax rate 21.00% 21.00% 21.00% 21.00%