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Equity (Tables)
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Summary of Stock Options
The following is a summary of stock options for the six months ended June 30, 2016:
 
Number of Options
 
Weighted Average
Exercise Price per
Option
Outstanding at December 31, 2015
774,551

 
$
159.66

Granted
150,323

 
250.07

Exercised
(92,653
)
 
143.45

Outstanding at June 30, 2016
832,221

 
177.80
Details of Stock Options Outstanding
Details of stock options outstanding as of June 30, 2016 are as follows:
 
Number of Options
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
(Years)
 
Aggregate
Intrinsic
Value
(In millions)
Vested or expected to vest
832,221

 
$
177.80

 
6.9
 
$
65

Exercisable
559,552

 
$
151.84

 
5.9
 
$
58
Stock Options Valuation Assumptions
During the six months ended June 30, 2016 and 2015, we used the weighted-average assumptions in the table below to compute the value of all options for shares of common stock granted to employees:
 
Six Months Ended June 30,
Assumptions:
2016
 
2015
Risk-free interest rate
1.51
%
 
1.08
%
Expected life in years
5.0

 
5.0

Expected volatility
24
%
 
24
%
Expected dividend yield
1.36
%
 
1.25
%
Estimated weighted-average fair value of options granted per share
$
49.39

 
$
40.94
Summary of Nonvested Restricted Stock Options
The following is a summary of the non-vested restricted shares for the six months ended June 30, 2016:  
 
Number of
Restricted
Stock Shares
 
Weighted Average
Grant-Date Fair
Value per Share
Non-vested at December 31, 2015
1,254,235
 
$
199.44

Granted
580,901
 
248.45

Vested
(447,715)
 
187.50

Forfeited
(36,541)
 
225.76

Non-vested at June 30, 2016
1,350,880
 
224.22