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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($) $ in Millions | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total Assets in the Fair Value Hierarchy | $ 297.6 | $ 254.3 |
Investments Measured at Net Asset Value | 271.0 | 372.0 |
Investments at Fair Value | 568.6 | 626.3 | $ 624.7
Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 126.0 | 163.2 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 171.6 | 91.1 |
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 | 202.8 | 149.8 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 76.7 | 104.9 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 126.1 | 44.9 |
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 | 40.0 | 39.7 |
Common stock | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 40.0 | 39.7 |
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 | 9.3 | 18.6 |
Cash | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 9.3 | 18.6 |
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 | 23.1 | 29.7 |
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 | 23.1 | 29.7 |
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 | 18.5 | 16.5 |
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 | 18.5 | 16.5 |
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 | 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 |  |
Other assets | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments at Fair Value | 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 |  |

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- Definition Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value Investments + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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