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Equity-Based Compensation Summary of Restricted Stock Units (Tables)
 12 Months Ended
Dec. 31, 2011
Summary of stock options  
Summary of the RSU activity
A summary of the RSU activity for 2011 follows:
(Restricted stock units in millions)
Number of restricted
stock units
 
Weighted-average fair
value per award
Non-vested at January 1
5.2

 
$
26.48

Granted
1.1

 
53.53

Vested
(1.3
)
 
25.92

Forfeited
(0.2
)
 
30.83

Non-vested at December 31
4.8

 
$
33.02