Repositioning Expenses - Schedule of Repositioning Expenses and Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Restructuring Reserve [Roll Forward]
Total repositioning liability at beginning of period	$ 3.4	$ 39.0	$ 22.9	$ 46.6	$ 46.6
Repositioning expenses	0.4	3.1	2.9	21.3
Repositioning expenses paid	(0.4)	(19.1)	(22.3)	(39.7)
Foreign exchange	(0.1)	(0.2)	(0.2)	(5.4)
Total repositioning liability at end of period	3.3	22.8	3.3	22.8	$ 22.9
Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.3	1.2	3.1	1.8
Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.1	1.9	(0.2)	19.5
Operating Segments | DPS
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.3	1.2	2.8	7.8
Operating Segments | DPS | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.3	1.0	3.1	2.1
Operating Segments | DPS | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.2	(0.3)	5.7
Operating Segments | PDS
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.0	0.0	0.0
Operating Segments | PDS | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.0	0.0	0.0
Operating Segments | PDS | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.0	0.0	0.0
Operating Segments | DSS
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.1	(0.3)	0.1	7.3
Operating Segments | DSS | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.2	0.0	0.2
Operating Segments | DSS | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.1	(0.5)	0.1	7.1
Other | Other
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	2.2	0.0	6.2
Other | Other | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.0	0.0	(0.5)
Other | Other | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses	$ 0.0	$ 2.2	$ 0.0	$ 6.7