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Income Taxes - Effective tax rate (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Percent        
Effective tax rate 20.50% 21.90% 18.70% 16.70%