Employee Benefits (Schedule of Change in Benefit Obligations and Changes in Fair Value of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 151.7	$ 138.9	$ 117.3
Service cost	10.7	10.2	8.9
Interest cost	5.0	4.4	4.3
Benefits paid	(3.7)	(2.6)	(2.3)
Actuarial (gain) loss	(16.6)	0.8	10.7
Benefit obligation, end of year	147.1	151.7	138.9
Change in plan assets [Roll Forward]
Fair value of plan assets, beginning of year	112.8	89.2	79.5
Actual return on plan assets	1.9	16.2	2.0
Employer contributions	10.0	10.0	10.0
Benefits paid	(3.7)	(2.6)	(2.3)
Fair value of plan assets, end of year	121.0	112.8	89.2
Funded status at end of year	$ (26.1)	$ (38.9)	$ (49.7)