Employee Benefits - Schedule of Components of Net Periodic Defined Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Retirement Benefits [Abstract]
Service cost	$ 4.6	$ 4.3	$ 9.2	$ 8.6
Interest cost	1.3	1.1	2.6	2.2
Expected return on plan assets	(3.9)	(3.1)	(7.9)	(6.2)
Recognized net actuarial gain	0.6	1.3	1.2	2.7
Net periodic defined benefit plan cost	$ 2.6	$ 3.6	$ 5.1	$ 7.3