Post Retirement Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	$ 171.8	$ 149.7
Unrecognized prior service cost (credit)	0.8	0.7
Accumulated other comprehensive loss (gain) - Pre-tax	172.6	150.4	$ 168.1
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	35.4	10.4
Accrued benefit liability	(177.0)	(78.0)
Accumulated other comprehensive loss (gain)	172.6	150.4	$ 168.1
Net amount recognized	31.0	82.8
United States
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	120.5	82.9
Unrecognized prior service cost (credit)	(1.0)	(1.1)
Accumulated other comprehensive loss (gain) - Pre-tax	119.5	81.8
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	0.0	0.0
Accrued benefit liability	(132.2)	(39.9)
Accumulated other comprehensive loss (gain)	119.5	81.8
Net amount recognized	(12.7)	41.9
Germany
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	19.2	13.1
Unrecognized prior service cost (credit)	0.0	0.0
Accumulated other comprehensive loss (gain) - Pre-tax	19.2	13.1
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	0.0	0.0
Accrued benefit liability	(44.1)	(38.1)
Accumulated other comprehensive loss (gain)	19.2	13.1
Net amount recognized	(24.9)	(25.0)
United Kingdom
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	25.3	49.5
Unrecognized prior service cost (credit)	3.3	3.5
Accumulated other comprehensive loss (gain) - Pre-tax	28.6	53.0
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	29.0	2.3
Accrued benefit liability	0.0	0.0
Accumulated other comprehensive loss (gain)	28.6	53.0
Net amount recognized	57.6	55.3
Netherlands
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	3.1	1.5
Unrecognized prior service cost (credit)	(1.5)	(1.7)
Accumulated other comprehensive loss (gain) - Pre-tax	1.6	(0.2)
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	3.2	5.0
Accrued benefit liability	0.0	0.0
Accumulated other comprehensive loss (gain)	1.6	(0.2)
Net amount recognized	4.8	4.8
Other International
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Unrecognized net actuarial loss	3.7	2.7
Unrecognized prior service cost (credit)	0.0	0.0
Accumulated other comprehensive loss (gain) - Pre-tax	3.7	2.7
Amounts recognized in the Consolidated Balance Sheets consist of:
Prepaid benefit cost	3.2	3.1
Accrued benefit liability	(0.7)	0.0
Accumulated other comprehensive loss (gain)	3.7	2.7
Net amount recognized	$ 6.2	$ 5.8