UNIT-BASED COMPENSATION PLANS - LTIP Activity for the Period (Details) - Long Term Incentive Plan 2013 $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Number of LP Units
Beginning Balance (in shares) | shares	1,011
Granted (in shares) | shares	631
Vested (in shares) | shares	(254)
Forfeited (in shares) | shares	(4)
Ending Balance (in shares) | shares	1,384
Weighted Average Grant Date Fair Value per LP Unit
Beginning Balance (in dollars per share) | $ / shares	$ 68.20
Granted (in dollars per share) | $ / shares	53.32
Vested (in dollars per share) | $ / shares	54.77
Forfeited (in dollars per share) | $ / shares	68.77
Ending Balance (in dollars per share) | $ / shares	$ 63.95
Additional disclosures
Compensation expense expected to be recognized | $	$ 55.0
Unrecognized compensation cost, weighted average period of recognition (in years)	2 years 2 months 12 days