Year Ended December 31, | ||||||||||||
2013 | 2012 | 2011 | ||||||||||
Number of units granted with performance conditions | 185,992 | 211,244 | 139,191 | |||||||||
Intrinsic value of units vesting (dollars in millions) | $ | 46.0 | $ | 38.2 | $ | 36.9 | ||||||
Total number of units granted | 838,207 | 674,578 | 682,246 | |||||||||
Weighted average grant date fair value per unit | $ | 57.95 | $ | 50.44 | $ | 50.67 |