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Stock-Based Compensation (Tables)
 9 Months Ended
Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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,
 
2019
 
2018
 
2019
 
2018
Stock-based compensation expense
$
7.8

 
$
5.5

 
$
30.6

 
$
21.6
Summary of Option Activity
The following is a summary of our stock option activity for the nine months ended August 31, 2019 and 2018:
 
2019
 
2018
(shares in millions)
Number
of
Shares
 
Weighted-
Average
Exercise
Price
 
Number
of
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
3.6

 
$
82.60

 
4.8

 
$
71.91

Granted
0.3

 
147.39

 
0.4

 
105.95

Exercised
(1.2
)
 
70.78

 
(0.9
)
 
51.82

Outstanding at end of the period
2.7

 
$
95.50

 
4.3

 
$
79.31

Exercisable at end of the period
2.0

 
$
86.08

 
3.4

 
$
73.52
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
2019
 
2018
Risk-free interest rates
2.2 - 2.5%
 
1.7 - 2.9%
Dividend yield
1.5%
 
2.0%
Expected volatility
17.4%
 
18.4%
Expected lives (in years)
7.5
 
7.6
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, 2019 and 2018:
 
2019
 
2018
(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
423

 
$
103.05

 
267

 
$
86.47

Granted
129

 
143.15

 
201

 
101.17

Vested
(134
)
 
96.74

 
(117
)
 
88.35

Forfeited
(9
)
 
112.10

 
(6
)
 
95.68

Outstanding at end of period
409

 
$
117.51

 
345

 
$
94.21
Schedule of Share Based Compensation, Performance Shares, Activity
The following is a summary of our LTPP activity for the nine months ended August 31, 2019 and 2018:
 
2019
 
2018
(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
218

 
$
83.55

 
220

 
$
84.31

Granted
102

 
150.51

 
86

 
101.90

Vested
(57
)
 
86.40

 
(59
)
 
74.02

Forfeited
—

 
—

 
(2
)
 
96.74

Outstanding at end of period
263

 
$
117.14

 
245

 
$
92.87