XML 72 R58.htm IDEA: XBRL DOCUMENT v3.5.0.2
Equity-based Awards, Phantom Unit Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Cash payments made in connection with DERs     $ 5.3 $ 3.4
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)     5,426,949  
Granted (in units) [1]     4,471,760  
Vested (in units)     (1,616,568)  
Forfeited (in units)     (267,309)  
End of period (in units) 8,014,832   8,014,832  
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) [2]     $ 33.63  
Granted weighted-average grant date fair value per unit (in dollars per unit) [1],[2]     21.86  
Vested weighted-average grant date fair value per unit (in dollars per unit) [2]     33.46  
Forfeited weighted-average grant date fair value per unit (in dollars per unit) [2]     28.75  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) [2] $ 27.26   $ 27.26  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Aggregate grant date fair value     $ 97.8  
Estimated forfeiture rate (in hundredths)     3.90%  
Cash payments made in connection with DERs $ 3.3 $ 2.2 $ 5.3 3.4
Total intrinsic value of phantom unit awards that vested during period 0.8 $ 2.1 37.1 $ 28.7
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost 121.3   $ 121.3  
Recognition period for total unrecognized compensation cost (in years)     2 years 1 month 6 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)     $ 21.86  
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)     $ 25.46  
Phantom Unit Awards [Member] | Enterprise [Member]        
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost $ 110.3   $ 110.3  
[1] The aggregate grant date fair value of phantom unit awards issued during 2016 was $97.8 million based on grant date market prices of our common units ranging from $21.86 per unit to $25.46 per unit. An estimated annual forfeiture rate of 3.9% 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.