Employee Benefits - Schedule of Changes in Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Change in benefit obligation
Benefit obligation, beginning of year	$ 147.1	$ 151.7	$ 138.9
Service cost	10.1	10.7	10.2
Interest cost	6.1	5.0	4.4
Benefits paid	(10.2)	(3.7)	(2.6)
Actuarial loss (gain)	36.6	(16.6)	0.8
Benefit obligation, end of year	189.7	147.1	151.7
Change in plan assets
Fair value of plan assets, beginning of year	121.0	112.8	89.2
Actual return on plan assets	12.1	1.9	16.2
Employer contributions	13.1	10.0	10.0
Benefits paid	(10.2)	(3.7)	(2.6)
Fair value of plan assets, end of year	136.0	121.0	112.8
Funded status at end of year	$ (53.7)	$ (26.1)	$ (38.9)