XML 20 R46.htm IDEA: XBRL DOCUMENT v2.4.0.8
Equity-based Awards, Phantom Unit Awards (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Cash payments made in connection with DERs     $ 1.2 $ 0
Phantom Unit Awards [Member]
        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate of phantom unit awards (in hundredths) 25.00%   25.00%  
Summary of awards activity, equity instruments other than options [Roll Forward]        
Beginning of period (in units)     0  
Granted (in units)     1,737,945 [1]  
Vested (in units)     (15,800)  
Forfeited (in units)     (32,070)  
End of period (in units) 1,690,075   1,690,075  
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)     $ 66.11 [1],[2]  
Vested weighted-average grant date fair value per unit (in dollars per unit)     $ 66.08 [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) $ 66.11 [2]   $ 66.11 [2]  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Aggregate grant date fair value     114.9  
Estimated forfeiture rate (in hundredths)     3.40%  
Cash payments made in connection with DERs 1.2 0 1.2 0
Total intrinsic value of phantom unit awards that vested during period 1.2 0 1.2 0
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost 84.2   84.2  
Recognition period for total unrecognized compensation cost     2 years 3 months 18 days  
Phantom Unit Awards [Member] | Minimum [Member]
        
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Grant date market price of common units (in dollars per unit)     $ 66.08  
Phantom Unit Awards [Member] | Maximum [Member]
        
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Grant date market price of common units (in dollars per unit)     $ 74.55  
Phantom Unit Awards [Member] | Enterprise [Member]
        
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost $ 77.4   $ 77.4  
[1] The aggregate grant date fair value of phantom unit awards issued during 2014 was $114.9 million based on a grant date market price of our common units ranging from $66.08 to $74.55 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.