Preferred and Common Stock - Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Stockholders' Equity Note [Abstract]
Total number of shares repurchased (in shares)	0.0	0.2	1.4
Average price paid per share (usd per share)	$ 0.00	$ 40.07	$ 33.48
Total cash paid for share repurchase	$ 0.0	$ 7.9	$ 46.6