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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Oct. 31, 2020
Share-based Payment Arrangement [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) | 2020 |  | 2019 |  | 2018
RSUs | $ | 11.5 |  |  | $ | 9.5 |  |  | $ | 9.3 |
Performance shares | 8.8 |  |  | 8.0 |  |  | 7.7 |
Share-based compensation expense before income taxes | 20.3 |  |  | 17.5 |  |  | 17.0 |
Income tax benefit | (5.7) |  |  | (4.9) |  |  | (5.1) |
Share-based compensation expense, net of taxes | $ | 14.6 |  |  | $ | 12.5 |  |  | $ | 11.8 |
Schedule of RSU Activity | RSU Activity
| Number of Shares (in millions) |  | Weighted-Average Grant Date Fair Value per Share
Outstanding at October 31, 2019 | 0.7 |  |  | $ | 36.92 |
Granted | 0.7 |  |  | 36.11 |
Vested (including 0.1 shares withheld for income taxes) | (0.2) |  |  | 37.24 |
Forfeited | (0.1) |  |  | 37.63 |
Outstanding at October 31, 2020 | 1.1 |  |  | $ | 36.32 |
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, 2019 | 0.8 |  |  | $ | 38.06 |
Granted | 0.4 |  |  | 35.92 |
Vested (including 0.1 shares withheld for income taxes) | (0.2) |  |  | 37.72 |
Performance adjustments | (0.1) |  |  | 36.85 |
Forfeited | (0.1) |  |  | 36.58 |
Outstanding at October 31, 2020 | 0.8 |  |  | $ | 37.35 |
Schedule of Monte Carlo Assumptions | Monte Carlo Assumptions
| 2020 |  | 2019 |  | 2018
Expected life(1) | 2.81 years |  | 2.81 years |  | 2.81 years
Expected stock price volatility(2) | 28.7 | % |  | 27.7 | % |  | 21.6 | %
Risk-free interest rate(3) | 1.5 | % |  | 2.5 | % |  | 2.0 | %
Stock price(4) | $ | 37.99 |  |  | $ | 34.92 |  |  | $ | 39.02 |
(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 Employee Stock Purchase Plan | Employee Stock Purchase Plan
| Years Ended October 31,
(in millions, except per share amounts) | 2020 |  | 2019 |  | 2018
Weighted-average fair value of granted purchase rights per share | $ | 1.75 |  |  | $ | 1.77 |  |  | $ | 1.70 |
Common stock issued | 0.1 |  |  | 0.1 |  |  | 0.1 |
Fair value of common stock issued per share | $ | 33.18 |  |  | $ | 33.60 |  |  | $ | 32.34 |
Aggregate purchases | $ | 3.5 |  |  | $ | 4.1 |  |  | $ | 4.7 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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