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Summary of Significant Accounting Policies - Effective Income Tax Rates (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Effective Income Tax Rate 26.50% 16.80% 25.70% 15.70%