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Share-Based Compensation Plans (Tables)
 12 Months Ended
Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Expense by Type of Award and Related Income Tax Benefit
Compensation Expense by Type of Award and Related Income Tax Benefit
 
Years Ended October 31,
(in millions)
2018
 
2017
 
2016
RSUs
$
9.3

 
$
7.2

 
$
7.1

Performance shares
7.7

 
6.1

 
6.7

Stock options
—

 
—

 
0.3

Share-based compensation expense before income taxes
17.0

 
13.3

 
14.0

Income tax benefit
(5.1
)
 
(5.4
)
 
(6.0
)
Share-based compensation expense, net of taxes
$
11.8

 
$
7.9

 
$
8.0
Schedule of RSU Activity
RSU Activity
 
Number of Shares (in millions)
 
Weighted-Average Grant Date Fair Value per Share
Outstanding at October 31, 2017
0.9

 
$
34.18

Granted
0.3

 
37.98

Vested (including 0.1 shares withheld for income taxes)
(0.3
)
 
29.10

Forfeited
(0.1
)
 
37.16

Outstanding at October 31, 2018
0.8

 
$
36.61
Schedule of Performance Share Activity
Performance Share Activity
 
Number of Shares (in millions)
 
Weighted-Average Grant Date Fair Value per Share
Outstanding at October 31, 2017
0.8

 
$
32.83

Granted
0.4

 
38.53

Vested (including 0.1 shares withheld for income taxes)
(0.2
)
 
30.38

Performance adjustments
—

 
37.93

Forfeited
(0.1
)
 
36.74

Outstanding at October 31, 2018
0.8

 
$
35.96
Schedule of Monte Carlo Assumptions
Monte Carlo Assumptions
 
2018
 
2017
 
2016
Expected life(1)
2.81 years

 
2.14 years

 
2.13 years

Expected stock price volatility(2)
21.6
%
 
21.4
%
 
19.0
%
Risk-free interest rate(3)
2.0
%
 
1.3
%
 
0.8
%
Stock price(4)
$
39.02

 
$
40.21

 
$
38.65

(1) The expected life represents the remaining performance period of the awards.
(2) The expected volatility for each grant is determined based on the historical volatility of our common stock over a period equal to the remaining term of the performance period from the date of grant for all awards.
(3) The risk-free interest rate is based on the continuous compounded yield on U.S. Treasury Constant Maturity Rates with varying remaining terms; the yield is determined over a time period commensurate with the performance period from the grant date.
(4) The stock price is the closing price of our common stock on the valuation date.
Schedule of Stock Option Activity
Stock Option Activity
 
Number of Shares
(in millions)
 
Weighted-Average Exercise Price per Share
 
Weighted-Average Remaining Contractual Term (in years)(1)
 
Aggregate Intrinsic Value (in millions)(2) 
Outstanding at October 31, 2017
0.2

 
$
16.29

 
 
 
 
Forfeited or expired
—

 
14.19

 
 
 
 
Exercised
(0.1
)
 
18.71

 
 
 
 
Outstanding at October 31, 2018
0.2

 
$
16.09

 
1.4
 
$
2.5

Exercisable at October 31, 2018
0.1

 
$
18.41

 
1.4
 
$
1.2

(1) Excludes contractual terms associated with plans prior to the 2006 Equity Plan due to the uncertainty of expiration.
(2) Amount by which the current market price of our common stock on October 31, 2018 exceeds the exercise price.
Schedule of Employee Stock Purchase Plan
Employee Stock Purchase Plan
 
Years Ended October 31,
(in millions, except per share amounts)
2018
 
2017
 
2016
Weighted-average fair value of granted purchase rights per share
$
1.70

 
$
2.11

 
$
1.63

Common stock issued
0.1

 
0.1

 
0.2

Fair value of common stock issued per share
$
32.34

 
$
40.07

 
$
30.94

Aggregate purchases
$
4.7

 
$
4.7

 
$
4.7