Employee Benefits (Schedule of Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Service cost	$ 2.7	$ 2.5	$ 5.4	$ 5.0
Interest cost	1.3	1.1	2.5	2.2
Expected return on plan assets	(2.3)	(1.8)	(4.6)	(3.6)
Recognized net actuarial loss	0.4	0.7	0.8	1.4
Net periodic pension cost	$ 2.1	$ 2.5	$ 4.1	$ 5.0