Common Stock - Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Jul. 31, 2016		Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Total number of shares repurchased (in shares)	1.0	[1]	0.6
Average price paid per share (in dollars per share)	$ 31.42	[1]	$ 32.23
Total cash paid for share repurchases	$ 31.2	[1]	$ 20.0
Cash paid for share repurchase	31.2		$ 20.0
2015 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Remaining authorized repurchase amount	$ 157.3

[1] Nine Months Ended July 31,(in millions, except per share amounts)2016 2015Total number of shares repurchased1.0 0.6Average price paid per share$31.42 $32.23Total cash paid for share repurchases$31.2 $20.0