UNIT-BASED COMPENSATION PLANS (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended					9 Months Ended		12 Months Ended		9 Months Ended
	Sep. 30, 2013 LTIP and Option Plan	Sep. 30, 2012 LTIP and Option Plan	Sep. 30, 2013 LTIP and Option Plan	Sep. 30, 2012 LTIP and Option Plan	Sep. 30, 2013 Long Term Incentive Plan 2009	Sep. 30, 2013 Long Term Incentive Plan 2009 Unit Option	Jun. 04, 2013 Long Term Incentive Plan 2009 Unit Option	Sep. 30, 2013 Long Term Incentive Plan 2009 Employee Phantom Stock Units	Sep. 30, 2013 Long Term Incentive Plan 2009 Employee Phantom Stock Units 2012 and 2011 Deferred Awards	Dec. 31, 2012 Long Term Incentive Plan 2009 Employee Phantom Stock Units 2012 and 2011 Deferred Awards	Dec. 31, 2011 Long Term Incentive Plan 2009 Employee Phantom Stock Units 2012 and 2011 Deferred Awards	Sep. 30, 2013 Long Term Incentive Plan 2009 Employee Performance Shares	Sep. 30, 2013 Long Term Incentive Plan 2009 Independent directors Phantom Stock Units	Sep. 30, 2013 LTIP	Dec. 31, 2012 LTIP	Sep. 30, 2013 LTIP Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense	$ 5.1	$ 2.8	$ 12.4	$ 10.5
LP Units, available for issuance																3,000,000
LP Units, additional units available for issuance						889,491								3,218,771
Outstanding grants (in shares)							193,913							859,000	745,000
Compensation awards deferred					$ 22.3					$ 1.4	$ 0.7
Awards granted								186,135	51,668	23,426		170,373	14,000	407,000