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