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CASH DISTRIBUTIONS (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
General Partner        
Distributions        
Incentive distributions allocated to the General Partner $ 0.3 $ 0.0 $ 0.6 $ 0.0
Common units        
Distributions        
Partnership distribution (in dollars per unit) $ 0.84 $ 0.81 $ 1.68 $ 1.62
Limited Partner and General Partner interests combined | Common units        
Distributions        
Partnership distribution $ 55.0 $ 52.0 $ 110.0 $ 103.0