Repositioning Expenses - Narrative (Details) € in Millions, $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 31, 2016 USD ($)	Jan. 31, 2016 EUR (€)	Jul. 31, 2015 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Oct. 31, 2015 EUR (€)	Apr. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Oct. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Repositioning expenses	$ 0.4		$ 3.1	$ 2.9	$ 21.3
Payments for restructuring	0.4		19.1	22.3	39.7
Repositioning liabilities	$ 3.3		22.8	$ 3.3	22.8		$ 3.4	$ 22.9	$ 39.0	$ 46.6
Accounts payable and accrued liabilities
Restructuring Cost and Reserve [Line Items]
Repositioning liabilities			22.7		22.7
Other long-term liabilities
Restructuring Cost and Reserve [Line Items]
Repositioning liabilities			$ 0.1		$ 0.1
DPS operations realignment | Shared Service Functions | Affiliated entity | Koninklijke DSM
Restructuring Cost and Reserve [Line Items]
Payments due | €						€ 14.1
Payments for restructuring | €		€ 14.1
DSS manufacturing facility closing | Facility closing
Restructuring Cost and Reserve [Line Items]
Repositioning expenses | €						€ 29.5