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Equity-Based Compensation (Phantom Units) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
years
Jun. 30, 2012
Phantom Units [Member]
Outstanding at the beginning of the period, Units   1,086,393
Service condition grants, Units   7,250
Vested service condition, Units   (23,553)
Vested market condition, Units   (10,200)
Forfeited or expired, Units   (64,934)
Forfeited market condition, Units   (3,750)
Outstanding at the end of period, Units   991,206
Outstanding at the beginning of the period, Weighted Average Grant Date Fair Value   $ 24.51
Service condition grants, Weighted Average Grant Date Fair Value   $ 24.40
Vested service condition, Weighted Average Grant Date Fair Value   $ 22.96
Vested market condition, Weighted Average Grant Date Fair Value   $ 19.52
Forfeited service condition, Weighted Average Grant Date Fair Value   $ 24.90
Forfeited market condition, Weighted Average Grant Date Fair Value   $ 19.52
Outstanding at the end of the period, Weighted Average Grant Date Fair Value   $ 24.59
Non-vested phantom units, compensation expense $ 17.8  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 3.8