Employee Benefits - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net (gain) loss	$ (4.0)	$ (34.1)	$ (24.4)
Amortizations of net gain	0.0	(2.5)	(5.4)
Total recognized in other comprehensive (income) loss	(4.0)	(36.6)	(29.8)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ 2.8	$ (26.2)	$ (15.2)