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Basis of Financial Statements - Income Tax (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Effective tax rate 23.80% 7.00% 13.50% 16.70%