Common Stock - Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Equity [Abstract]
Average price paid per share (in dollars per share)	$ 40.07	$ 28.19
Total number of shares repurchased (in shares)	0.2	0.4
Total cash paid for share repurchases	$ 7.9	$ 11.3