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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Details) - USD ($) $ in Millions | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
--- | --- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | $ 1,017.0 | $ 594.8 | $ 568.6
Total Assets in the Fair Value Hierarchy | 371.9 | 286.2 |
Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 59.7 | 100.8 |
Total Assets in the Fair Value Hierarchy | 59.7 | 100.8 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 312.2 | 185.4 |
Total Assets in the Fair Value Hierarchy | 312.2 | 185.4 |
Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Total Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Mutual funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 163.0 | 203.7 |
Investments Measured at Net Asset Value | 358.5 | 44.6 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 25.6 | 63.0 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 137.4 | 140.7 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Insurance contracts |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Investments Measured at Net Asset Value | 130.2 | 124.0 |
Common stock |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 27.6 | 35.9 |
Investments Measured at Net Asset Value | 81.5 | 42.7 |
Common stock | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 27.6 | 35.9 |
Common stock | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Common stock | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 6.5 | 1.9 |
Cash | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 6.5 | 1.9 |
Cash | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Cash | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 134.8 | 26.1 |
Investments Measured at Net Asset Value | 70.8 | 97.3 |
Corporate bonds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 134.8 | 26.1 |
Corporate bonds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 39.8 | 17.8 |
Investments Measured at Net Asset Value | 4.1 |  |
Government bonds | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Government bonds | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 39.8 | 17.8 |
Government bonds | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Other assets |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.2 | 0.8 |
Other assets | Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.0 | 0.0 |
Other assets | Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | 0.2 | 0.8 |
Other assets | Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assets in the Fair Value Hierarchy | $ 0.0 | $ 0.0 |

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