Employee Benefits (Schedule of Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Retirement Benefits, Description [Abstract]
Service cost	$ 2.7	$ 2.7	$ 5.4	$ 5.4
Interest cost	1.3	1.3	2.5	2.5
Expected return on plan assets	(2.3)	(2.3)	(4.6)	(4.6)
Recognized net actuarial loss	0.4	0.4	0.8	0.8
Net periodic pension cost	$ 2.1	$ 2.1	$ 4.1	$ 4.1