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Income Tax - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Effective income tax rate (as a percent) 23.00% 27.00% 22.00% 23.00%