Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets in the Fair Value Hierarchy	$ 1,002.1	$ 1,017.0
Total Assets in the Fair Value Hierarchy	440.9	371.9
Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets in the Fair Value Hierarchy	33.3	59.7
Total Assets in the Fair Value Hierarchy	33.3	59.7
Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets in the Fair Value Hierarchy	407.6	312.2
Total Assets in the Fair Value Hierarchy	407.6	312.2
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]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	131.6	163.0
Mutual funds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	9.2	25.6
Mutual funds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	122.4	137.4
Mutual funds | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Mutual funds | Investments Measured at Net Asset Value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments Measured at Net Asset Value	0.5	358.5
Insurance contracts | Investments Measured at Net Asset Value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments Measured at Net Asset Value	132.9	130.2
Common stock
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	9.3	27.6
Common stock | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	9.3	27.6
Common stock | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Common stock | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Common stock | Investments Measured at Net Asset Value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments Measured at Net Asset Value	215.4	81.5
Cash
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	14.8	6.5
Cash | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	14.8	6.5
Cash | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Cash | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Corporate bonds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	250.3	134.8
Corporate bonds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Corporate bonds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	250.3	134.8
Corporate bonds | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Corporate bonds | Investments Measured at Net Asset Value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments Measured at Net Asset Value	203.1	70.8
Government bonds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	34.2	39.8
Government bonds | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Government bonds | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	34.2	39.8
Government bonds | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Government bonds | Investments Measured at Net Asset Value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments Measured at Net Asset Value	9.3	4.1
Other assets
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.7	0.2
Other assets | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.0	0.0
Other assets | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	0.7	0.2
Other assets | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount	$ 0.0	$ 0.0