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INCOME TAX - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Effective tax rate (as a percent) (18.70%) (3.40%) 10.10% 10.40%
Reduction of estimated transition tax liability associated with the U.S. Tax Cuts and Jobs Act of 2017   $ 23.3   $ 23.3