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Income Taxes - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Effective income tax rate on pre-tax income or loss 23.30% 21.90% 19.90% 19.20%