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INCOME TAX - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Effective tax rate (as a percent) (21.20%) 3.00% (16.80%) (9.00%)