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