Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Redeemable Noncontrolling Interest, Equity [Roll Forward]
Redeemable noncontrolling interests, beginning balance	$ 21.3	$ 35.5
Current period mark to redemption value	(0.4)	(4.9)
Repurchase of redeemable shareholder interest		11.9
Redeemable noncontrolling interest share of income and other	0.1	2.3	$ 3.7
Dividends to redeemable noncontrolling interest and other	(1.0)	0.3
Redeemable noncontrolling interests, ending balance	$ 20.0	$ 21.3	$ 35.5