Post Retirement Benefit Plans - Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Special Events
Settlement	$ 0.9	$ 1.5		$ 25.9
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 12.3	13.3	$ 12.4
Interest cost			18.9	18.2	22.0
Expected return on plan assets			(25.5)	(27.7)	(32.1)
Amortization of prior service cost			(0.2)	(0.1)	(0.2)
Recognized net actuarial loss			11.0	10.9	11.4
Other Adjustments			2.8
Special Events
Settlement			1.3	27.8	0.1
Net periodic pension (benefit) cost			20.6	42.4	13.6
Pension Plan | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost			10.8	11.8	10.2
Interest cost			13.2	12.9	13.7
Expected return on plan assets			(16.8)	(15.6)	(19.0)
Amortization of prior service cost			(0.1)	0.0	(0.1)
Recognized net actuarial loss			8.1	8.1	9.3
Other Adjustments			0.0
Special Events
Settlement			0.0	25.9	0.0
Net periodic pension (benefit) cost			15.2	43.1	14.1
Pension Plan | Foreign Plan | Germany
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.4	0.5	0.5
Interest cost			0.5	0.5	0.8
Expected return on plan assets			0.0	0.0	0.0
Amortization of prior service cost			0.0	0.0	0.0
Recognized net actuarial loss			1.1	1.3	1.0
Other Adjustments			0.0
Special Events
Settlement			0.0	0.7	0.0
Net periodic pension (benefit) cost			2.0	3.0	2.3
Pension Plan | Foreign Plan | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.5	0.5	0.8
Interest cost			4.0	3.8	5.7
Expected return on plan assets			(6.5)	(10.2)	(10.7)
Amortization of prior service cost			0.0	0.0	0.0
Recognized net actuarial loss			1.7	1.5	0.8
Other Adjustments			2.8
Special Events
Settlement			1.3	1.2	0.0
Net periodic pension (benefit) cost			3.8	(3.2)	(3.4)
Pension Plan | Foreign Plan | Netherlands
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.5	0.4	0.7
Interest cost			0.9	0.7	1.4
Expected return on plan assets			(1.4)	(1.2)	(1.7)
Amortization of prior service cost			(0.1)	(0.1)	(0.1)
Recognized net actuarial loss			0.0	0.0	0.3
Other Adjustments			0.0
Special Events
Settlement			0.0	0.0	0.0
Net periodic pension (benefit) cost			(0.1)	(0.2)	0.6
Pension Plan | Foreign Plan | Other International
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.1	0.1	0.2
Interest cost			0.3	0.3	0.4
Expected return on plan assets			(0.8)	(0.7)	(0.7)
Amortization of prior service cost			0.0	0.0	0.0
Recognized net actuarial loss			0.1	0.0	0.0
Other Adjustments			0.0
Special Events
Settlement			0.0	0.0	0.1
Net periodic pension (benefit) cost			$ (0.3)	$ (0.3)	$ 0.0