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Income Tax - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) 15.00% 30.00% 19.00% 26.00%