Employee Benefits - Schedule of Components of Net Periodic Defined Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 4.3	$ 5.2	$ 12.9	$ 12.1
Interest cost	1.1	0.9	3.3	3.5
Expected return on plan assets	(3.1)	(3.6)	(9.3)	(9.0)
Recognized net actuarial loss	1.3	1.8	4.0	3.8
Net periodic defined benefit plan cost	$ 3.6	$ 4.3	$ 10.9	$ 10.4