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Equity-based Awards, Phantom Unit Awards (Details) (Phantom Unit Awards [Member], USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rate of phantom unit awards (in hundredths) 25.00%
Summary of awards activity, equity instruments other than options [Roll Forward]  
Beginning of period (in units) 0
Granted (in units) 1,731,645 [1]
Forfeited (in units) (7,250)
End of period (in units) 1,724,395
Phantom units outstanding, weighted-average grant date fair value [Roll Forward]  
Weighted-average grant date fair value per unit, at beginning of period (in dollars per unit) $ 0 [2]
Granted weighted-average grant date fair value per unit (in dollars per unit) $ 66.08 [1],[2]
Forfeited weighted-average grant date fair value per unit (in dollars per unit) $ 66.08 [2]
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) $ 66.08 [2]
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]  
Aggregate grant date fair value $ 114.4
Grant date market price of common units (in dollars per unit) $ 66.08
Estimated forfeiture rate (in hundredths) 3.40%
Unrecognized Compensation Expense [Abstract]  
Unrecognized compensation cost 98.7
Recognition period for total unrecognized compensation cost 2 years 4 months 24 days
Enterprise [Member]
  
Unrecognized Compensation Expense [Abstract]  
Unrecognized compensation cost $ 91.2
[1] The aggregate grant date fair value of phantom unit awards issued during 2014 was $114.4 million based on a grant date market price of our common units of $66.08 per unit. An estimated annual forfeiture rate of 3.4% was applied to these awards.
[2] Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.