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Employee Benefits - Fair Value Measurement of Plan Assets (Details) - USD ($) $ in Millions | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
--- | --- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | $ 199.5 | $ 159.5 | $ 136.0 | $ 121.0
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 169.2 |  |  |
Significant Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 30.2 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.1 |  |  |
Cash and cash equivalents |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 10.0 |  |  |
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 10.0 |  |  |
Cash and cash equivalents | Significant Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Equity mutual funds |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 125.3 |  |  |
Equity mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 125.3 |  |  |
Equity mutual funds | Significant Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Equity mutual funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Hedging Strategy Funds |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 9.4 |  |  |
Hedging Strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 9.4 |  |  |
Hedging Strategy Funds | Significant Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Hedging Strategy Funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 0.0 |  |  |
Bond mutual funds |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 54.8 |  |  |
Bond mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 24.5 |  |  |
Bond mutual funds | Significant Observable Inputs (Level 2) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | 30.2 |  |  |
Bond mutual funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Fair value of plan assets | $ 0.1 |  |  |

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