Employee Benefits - Schedule of Components of Net Periodic Pension Costs and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 10.1	$ 10.7	$ 10.2
Interest cost	6.1	5.0	4.4
Expected return on plan assets	(9.8)	(9.2)	(7.3)
Recognized actuarial loss	0.8	1.7	2.7
Net periodic pension cost	$ 7.2	$ 8.2	$ 10.0