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Equity-Based Compensation (Phantom Common Unit Awards) (Details) (Phantom Common Units [Member], USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Granted, Weighted Average Grant Date Fair Value $ 23.09
2012 LTIP [Member]
 
Nonvested, Number of Shares [Roll Forward]  
Non-vested at beginning of the period, Shares 0
Granted, shares 32,500
Non-vested at end of period, Shares 32,500
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Non-vested at beginning of the period, Weighted Average Grant Date Fair Value $ 0.00
Non-vested at end of period, Weighted Average Grant Date Fair Value $ 23.09
Cost not yet recognized, share-based awards other than options $ 0.7
Cost not yet recognized, period for recognition 3 years
Fair value of nonvested awards oustanding $ 0.8
Non-employee director [Member] | 2012 LTIP [Member]
 
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Vesting period 3 years
Employee [Member] | 2012 LTIP [Member]
 
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Vesting period 5 years