REPOSITIONING EXPENSES - Schedule of Repositioning Expenses and Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Restructuring Reserve [Roll Forward]
Total repositioning liability at beginning of period	$ 4.6	$ 4.9	$ 5.4	$ 22.9
Repositioning expenses	1.8	1.3	2.4	2.5
Repositioning expenses paid	(1.6)	(3.1)	(3.1)	(21.8)
Foreign exchange	0.1	0.3	0.2	(0.2)
Total repositioning liability at end of period	4.9	3.4	4.9	3.4
Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	1.8	1.6	2.4	2.8
Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses		(0.3)		(0.3)
Operating Segments | DPS
Restructuring Reserve [Roll Forward]
Repositioning expenses		1.3		2.5
Operating Segments | DPS | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	1.7	1.6	1.9	2.8
Operating Segments | DPS | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses		(0.3)		(0.3)
Operating Segments | PDS
Restructuring Reserve [Roll Forward]
Repositioning expenses		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
Operating Segments | DSS
Restructuring Reserve [Roll Forward]
Repositioning expenses		0.0		0.0
Operating Segments | DSS | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	0.0	0.0	0.0	0.0
Operating Segments | DSS | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses		0.0		0.0
Other | Other
Restructuring Reserve [Roll Forward]
Repositioning expenses		0.0		0.0
Other | Other | Employee-related expenses
Restructuring Reserve [Roll Forward]
Repositioning expenses	$ 0.1	0.0	$ 0.5	0.0
Other | Other | Consulting, professional and project management costs
Restructuring Reserve [Roll Forward]
Repositioning expenses		$ 0.0		$ 0.0