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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 19.7 $ 16.7 $ 15.9
Capital leases, balance sheet, assets by major class, net 2.8 3.2  
Capital leases, lessee balance sheet, assets by major class, accumulated depreciation $ 1.9 $ 1.4