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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Amortization Expense (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 2.4
2020 2.9
2021 4.7
2022 7.2
2023 $ 10.7