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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option rights
The fair value of the Company’s option rights was estimated at the date of grant using a Black-Scholes-Merton option-pricing model with the following weighted-average assumptions for all options granted:
 
2012
 
2011
 
2010
Risk-free interest rate
.78%
 
1.13%
 
1.16%
Expected life of option rights
5.11 years
 
5.27 years
 
5.27 years
Expected dividend yield
of stock
1.43%
 
1.77%
 
1.84%
Expected volatility of stock
.274
 
.303
 
.304
Company's non-qualified and incentive stock option right activity for employees and nonemployee directors
A summary of the Company’s non-qualified and incentive stock option right activity for employees and nonemployee directors, and related information for the years ended December 31 is shown in the following table:
 
2012
 
2011
 
2010
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
 
Optioned
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Aggregate
Intrinsic
Value
Outstanding beginning
of year
9,857,695

 
$
60.31

 
 
 
10,009,385

 
$
55.82

 
 
 
10,897,652

 
$
50.30

 
 
Granted
1,089,240

 
152.93

 
 
 
1,407,259

 
78.72

 
 
 
1,586,984

 
72.48

 
 
Exercised
(4,140,822
)
 
53.40

 
 
 
(1,480,058
)
 
47.15

 
 
 
(2,436,639
)
 
41.95

 
 
Forfeited
(57,730
)
 
78.01

 
 
 
(76,354
)
 
67.02

 
 
 
(34,999
)
 
58.90

 
 
Expired
(257
)
 
72.65

 
 
 
(2,537
)
 
53.65

 
 
 
(3,613
)
 
54.71

 
 
Outstanding end of year
6,748,126

 
$
79.39

 
$
494,699

 
9,857,695

 
$
60.31

 
$
287,526

 
10,009,385

 
$
55.82

 
$
281,349

Exercisable at end of year
4,245,891

 
$
61.43

 
$
386,484

 
6,908,116

 
$
54.24

 
$
243,440

 
6,655,569

 
$
50.78

 
$
220,647
Summary of grants of restricted stock to certain officers, key employees and non-employee directors
A summary of grants of restricted stock to certain officers, key employees and nonemployee directors during each year is as follows:
 
2012
 
2011
 
2010
Restricted stock granted
301,856

 
300,677

 
348,460

Weighted-average per share
fair value of restricted stock
granted during the year
$
99.47

 
$
84.86

 
$
64.49
Summary of the Company's restricted stock activity
A summary of the Company’s restricted stock activity for the years ended December 31 is shown in the following table:
 
2012
 
2011
 
2010
Outstanding at beginning
of year
1,304,891

 
1,266,201

 
1,304,386

Granted
301,856

 
300,677

 
348,460

Vested
(412,859
)
 
(16,072
)
 
(300,598
)
Forfeited
(274,140
)
 
(245,915
)
 
(86,047
)
Outstanding at end of year
919,748

 
1,304,891

 
1,266,201