CASH DISTRIBUTIONS - Distributions Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Distributions
Incentive distribution paid to the General Partner	$ 1.0	$ 0.3
Common units
Distributions
Per Unit Distribution, paid (in dollars per unit)	$ 0.89	$ 0.84
Common units and General Partner interest combined
Distributions
Total cash distributions	$ 60.0	$ 55.0