Employee Benefits - Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net loss (gain)	$ 34.2	$ (9.3)	$ (8.1)
Amortizations of net (gain)	(0.8)	(1.7)	(2.7)
Total recognized in other comprehensive income	33.4	(11.0)	(10.8)
Total recognized in net periodic benefit cost and other comprehensive income	$ 40.6	$ (2.8)	$ (0.8)