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COMMITMENTS AND CONTINGENCIES - Purchase Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Purchase Commitments      
Aggregate value of raw material purchases $ 289.6 $ 273.6 $ 205.9
Raw materials      
Purchase Commitments      
Purchase commitments $ 49.8    
Obligation term ( in years) 1 year