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GOODWILL AND INTANGIBLE ASSETS - TEXTUALS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense $ 35.9 $ 37.8 $ 39.1