Discontinued Operations - Summary of Operating Results (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Jul. 31, 2016	Jan. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Revenues		$ 0.0		$ 98.9	$ 0.0	$ 287.5
Expenses		2.9		98.6	4.7	281.2
Working capital adjustment to previously recorded gain		0.0		0.0	3.1	0.0
(Loss) income from discontinued operations before income taxes		(2.9)		0.3	(7.8)	6.3
Income tax benefit (provision)	[1]	1.1		0.0	3.9	(0.3)
Net (loss) income from discontinued operations		$ (1.8)		$ 0.3	(3.9)	6.0
Net cash used in operating activities of discontinued operations	[2]				$ (25.6)	$ (3.5)
Security
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income taxes paid			$ 20.6

[1] For the nine months ended July 31, 2016, the income tax benefit includes the retroactive reinstatement of the Work Opportunity Tax Credits (“WOTC”).

[2] During the first quarter of 2016, we paid $20.6 million in taxes in connection with the sale of our Security business.