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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2017
Share-based Compensation [Abstract]  
Stock Based Compensation in Selling, General and Administrative Expense
The following table sets forth the stock-based compensation expense recorded in selling, general and administrative (SG&A) expense (in millions):
 
Three months ended August 31,
 
Nine months ended August 31,
 
2017
 
2016
 
2017
 
2016
Stock-based compensation expense
$
4.0

 
$
4.0

 
$
18.4

 
$
19.8
Schedule of Assumptions Used
 
2017
 
2016
Risk-free interest rates
0.9 - 2.4%
 
0.5 - 1.9%
Dividend yield
1.9%
 
1.7%
Expected volatility
18.7%
 
18.7%
Expected lives (in years)
7.6
 
7.6
Summary of Option Activity
The following is a summary of our stock option activity for the nine months ended August 31, 2017 and 2016:
 
2017
 
2016
(shares in millions)
Number
of
Shares
 
Weighted-
Average
Exercise
Price
 
Number
of
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
4.9

 
$
66.00

 
4.8

 
$
59.20

Granted
0.6

 
98.07

 
0.7

 
99.92

Exercised
(0.6
)
 
49.50

 
(0.6
)
 
50.95

Outstanding at end of the period
4.9

 
$
71.59

 
4.9

 
$
66.07

Exercisable at end of the period
3.9

 
$
65.12

 
3.4

 
$
56.97
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following is a summary of our RSU activity for the nine months ended August 31, 2017 and 2016:
 
2017
 
2016
(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
267

 
$
80.08

 
270

 
$
71.03

Granted
130

 
94.63

 
104

 
96.59

Vested
(118
)
 
80.62

 
(94
)
 
72.21

Forfeited
(12
)
 
90.65

 
(10
)
 
80.47

Outstanding at end of period
267

 
$
86.49

 
270

 
$
80.17
Schedule of Share Based Compensation, Performance Shares, Activity
The following is a summary of our LTPP activity for the nine months ended August 31, 2017 and 2016:
 
2017
 
2016
(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
201

 
$
78.10

 
192

 
$
70.94

Granted
78

 
89.96

 
108

 
86.40

Vested
(43
)
 
69.04

 
(18
)
 
64.74

Forfeited
—

 
—

 
(8
)
 
79.45

Outstanding at end of period
236

 
$
83.63

 
274

 
$
77.22