UNIT-BASED COMPENSATION PLANS (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended					6 Months Ended		12 Months Ended		6 Months Ended
	Jun. 30, 2013 LTIP and Option Plan	Jun. 30, 2012 LTIP and Option Plan	Jun. 30, 2013 LTIP and Option Plan	Jun. 30, 2012 LTIP and Option Plan	Jun. 30, 2013 Long Term Incentive Plan 2009	Jun. 30, 2013 Long Term Incentive Plan 2009 Unit Option	Jun. 04, 2013 Long Term Incentive Plan 2009 Unit Option	Jun. 30, 2013 Long Term Incentive Plan 2009 Employee Phantom Stock Units	Jun. 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	Jun. 30, 2013 Long Term Incentive Plan 2009 Employee Performance Shares	Jun. 30, 2013 Long Term Incentive Plan 2009 Independent directors Phantom Stock Units	Jun. 30, 2013 LTIP	Dec. 31, 2012 LTIP	Jun. 30, 2013 LTIP Unit Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4.0	$ 5.1	$ 7.3	$ 7.7
LP Units, available for issuance																3,000,000
LP Units, additional units available for issuance						889,491										3,207,094
Outstanding grants (in shares)							193,913							871,000	745,000
Compensation awards deferred					$ 27.0					$ 1.4	$ 0.7
Awards granted								185,497	51,668	23,426		169,735	14,000	406,000