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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Increase in royalties payable $ 0.1 $ 0.1  
Warranty reserve 0.2   $ 0.2
Unconditional purchase obligations 32.1    
Operating lease payments under noncancelable operating leases $ 11.1