Post Retirement Benefit Plans - Amounts Recognized in Consolidated Financial Statements - in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	$ 149.7	$ 171.8
Unrecognized prior service cost (credit)	0.9	0.8
Accumulated other comprehensive loss (gain) - Pre-tax	150.6	172.6	$ 150.4
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	29.5	35.4
Accrued benefit liability	(137.7)	(177.0)
Accumulated other comprehensive loss (gain)	150.6	172.6	$ 150.4
Net amount recognized	42.4	31.0
United States
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	94.1	120.5
Unrecognized prior service cost (credit)	(0.8)	(1.0)
Accumulated other comprehensive loss (gain) - Pre-tax	93.3	119.5
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	0.0	0.0
Accrued benefit liability	(94.7)	(132.2)
Accumulated other comprehensive loss (gain)	93.3	119.5
Net amount recognized	(1.4)	(12.7)
Germany
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	14.8	19.2
Unrecognized prior service cost (credit)	0.0	0.0
Accumulated other comprehensive loss (gain) - Pre-tax	14.8	19.2
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	0.0	0.0
Accrued benefit liability	(42.1)	(44.1)
Accumulated other comprehensive loss (gain)	14.8	19.2
Net amount recognized	(27.3)	(24.9)
United Kingdom
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	32.4	25.3
Unrecognized prior service cost (credit)	3.2	3.3
Accumulated other comprehensive loss (gain) - Pre-tax	35.6	28.6
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	25.3	29.0
Accrued benefit liability	0.0	0.0
Accumulated other comprehensive loss (gain)	35.6	28.6
Net amount recognized	60.9	57.6
Netherlands
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	4.5	3.1
Unrecognized prior service cost (credit)	(1.5)	(1.5)
Accumulated other comprehensive loss (gain) - Pre-tax	3.0	1.6
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	1.1	3.2
Accrued benefit liability	0.0	0.0
Accumulated other comprehensive loss (gain)	3.0	1.6
Net amount recognized	4.1	4.8
Other International
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	3.9	3.7
Unrecognized prior service cost (credit)	0.0	0.0
Accumulated other comprehensive loss (gain) - Pre-tax	3.9	3.7
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	3.1	3.2
Accrued benefit liability	(0.9)	(0.7)
Accumulated other comprehensive loss (gain)	3.9	3.7
Net amount recognized	$ 6.1	$ 6.2