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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total Assets in the Fair Value Hierarchy | $ 286.2 | $ 297.6 |
Investments Measured at Net Asset Value | 308.6 | 271.0 |
Investments at Fair Value | 594.8 | 568.6 | $ 626.3
Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 100.8 | 126.0 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 185.4 | 171.6 |
Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Mutual funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 203.7 | 202.8 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 63.0 | 76.7 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 140.7 | 126.1 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Common stock |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 35.9 | 40.0 |
Common stock | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 35.9 | 40.0 |
Common stock | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Common stock | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 1.9 | 9.3 |
Cash | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 1.9 | 9.3 |
Cash | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Cash | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 26.1 | 23.1 |
Corporate bonds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 26.1 | 23.1 |
Corporate bonds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 17.8 | 18.5 |
Government bonds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Government bonds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 17.8 | 18.5 |
Government bonds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Other assets |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.8 | 3.9 |
Other assets | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.0 | 0.0 |
Other assets | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 0.8 | 3.9 |
Other assets | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | $ 0.0 | $ 0.0 |

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