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INCOME TAX - 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 tax rate (as a percent) 19.90% 19.10% 18.40% 19.60%