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Stock-Based Compensation (Tables)
9 Months Ended
Aug. 31, 2013
Share-based Compensation [Abstract]  
Stock Based Compensation in Selling, General and Administrative Expense
The following table sets forth the stock-based compensation recorded in selling, general and administrative (SG&A) expense (in millions):
 
Three months ended August 31,
 
Nine months ended August 31,
 
2013
 
2012
 
2013
 
2012
Stock-based compensation expense
$
3.6

 
$
3.3

 
$
16.1

 
$
11.9

Schedule of Assumptions Used
The fair values of option grants in the stated periods were computed using the following range of assumptions for our various stock compensation plans:
 
2013
 
2012
Risk-free interest rates
0.1 - 1.8%
 
0.1 - 2.2%
Dividend yield
1.9%
 
2.3%
Expected volatility
14.5 - 20.6%
 
16.5 - 21.6%
Expected lives
6.2
 
6.1
Summary of Option Activity
The following is a summary of all stock option activity for the nine months ended August 31, 2013 and 2012:
 
2013
 
2012
(shares in millions)
Number
of
Shares
 
Weighted-
Average
Exercise
Price
 
Number
of
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
5.1

 
$
40.06

 
6.6

 
$
34.98

Granted
0.9

 
71.60

 
0.8

 
54.24

Exercised
(1.0
)
 
32.59

 
(1.7
)
 
30.41

Outstanding at end of the period
5.0

 
47.28

 
5.7

 
39.31

Exercisable at end of the period
3.0

 
$
39.68

 
3.4

 
$
34.78

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following is a summary of all of our RSU activity for the nine months ended August 31, 2013 and 2012:
 
2013
 
2012
(shares in thousands)
Number
of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
 
Number
of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at beginning of period
192

 
$
49.65

 
233

 
$
43.23

Granted
89

 
71.60

 
112

 
54.24

Vested
(113
)
 
51.09

 
(146
)
 
42.74

Forfeited
(3
)
 
55.16

 
(6
)
 
47.42

Outstanding at end of period
165

 
$
60.64

 
193

 
$
49.84

Schedule of Share Based Compensation, Performance Shares, Activity [Table Text Block]
The following is a summary of the MTIP award activity for the nine months ended August 31, 2013 and 2012:
 
2013
 
2012
(shares in thousands)
Number
of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
 
Number
of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at beginning of period
240

 
$
46.63

 
120

 
$
44.47

Granted
94

 
64.74

 
120

 
48.78

Outstanding at end of period
334

 
$
51.73

 
240

 
$
46.63