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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of transactions of the Company's stock options
The following table summarizes the transactions of the Company's stock options:
 
Stock Options
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
(years)
Unexercised options outstanding—December 31, 2012
3.8

 
$
74.04

 
 
Options granted
0.0

 
175.28

 
 
Options exercised
(0.8
)
 
62.45

 
 
Unexercised options outstanding—September 30, 2013
3.0

 
77.38

 
3.7
Exercisable at September 30, 2013
1.8

 
71.69

 
3.3
Summary of transactions of the Company's restricted stock
The following table summarizes the transactions of the Company's restricted stock units:
 
Restricted
Stock
 
Weighted
Average
Grant Date
Value
Unvested units—December 31, 2012
0.4

 
$
84.53

Units granted
0.0

 
174.91

Units issued
(0.1
)
 
85.63

Unvested units—September 30, 2013
0.3

 
86.31