Share-Based Compensation Plans - Stock Option Narrative (Details) - Performance shares - USD ($) $ / shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2015	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable rate		25.00%
Expiration period		7 years
Total unrecognized compensation cost, net of estimated forfeitures		$ 0.8
Weighted-average vesting period		1 year 7 months
Total intrinsic value of stock options exercised		$ 8.8	$ 3.8	$ 4.1
Weighted average intrinsic value share granted (in dollars per share)				$ 0.0
Intrinsic value vested	$ 2.1		$ 1.5	$ 1.4