Income Taxes - Operating Loss Carryforward Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Operating Loss Carryforwards, Valuation Allowance Rollforward [Roll Forward]
Valuation allowance at the beginning of the year	$ 6.2	$ 6.2	$ 6.0
Sale of Security business	(0.8)	0.0	0.0
Other, net	0.1	0.0	0.2
Valuation allowance at the end of the year	$ 5.5	$ 6.2	$ 6.2