Employee Benefits - Changes in Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Change in benefit obligation
Benefit obligation, beginning of year	$ 218.8	$ 189.7	$ 147.1
Service cost	17.2	13.9	10.1
Interest cost	4.4	5.2	6.1
Benefits paid	(11.5)	(10.0)	(10.2)
Actuarial loss	2.0	20.0	36.6
Benefit obligation, end of year	230.9	218.8	189.7
Change in plan assets
Fair value of plan assets, beginning of year	159.5	136.0	121.0
Actual return on plan assets	38.8	10.1	12.1
Employer contributions	12.7	23.4	13.1
Benefits paid	(11.5)	(10.0)	(10.2)
Fair value of plan assets, end of year	199.5	159.5	136.0
Funded status at end of year	$ (31.4)	$ (59.3)	$ (53.7)