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DISTRIBUTION AGREEMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DISTRIBUTION AGREEMENTS      
Termination costs $ 26.6 $ 35.4 $ 79.8
Distribution agreement (in years) 20 years    
Revenue recognized $ 21.9 $ 22.3 $ 26.1