Preferred and Common Stock Preferred and Common Stock - Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased, number of shares	1.4	1.0	0.8
Average price paid per share (in usd per share)	$ 33.48	$ 30.72	$ 26.20
Total cash paid for share repurchase	$ 46.6	$ 31.4	$ 20.0