Restructuring and Integration Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015	Oct. 31, 2015	Oct. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities, completion date			Oct. 31, 2016
Sauflon [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 125.0		$ 125.0
Additions during the period			15.7		$ 55.6	$ 36.1
Integration costs	2.1	$ 8.0	10.0	$ 14.1
Sauflon [Member] | Product Rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	95.0		95.0
Additions during the period			14.7		57.7	15.3
Sauflon [Member] | Product Rationalization [Member] | Cost of sales [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	4.2	5.2	14.7	13.9
Sauflon [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	27.0		27.0
Additions during the period			0.7		(2.5)	20.3
Sauflon [Member] | Employee Severance [Member] | Cost of sales [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period	0.7		0.5
Sauflon [Member] | Employee Severance [Member] | Selling, general and administrative expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period		(4.5)	0.1
Sauflon [Member] | Employee Severance [Member] | Research and development expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period		$ 0.2	0.1	$ 0.3
Sauflon [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 3.0		3.0
Additions during the period			0.3		$ 0.4	$ 0.5
Sauflon [Member] | Facility Closing [Member] | Selling, general and administrative expense [Member]
Restructuring Cost and Reserve [Line Items]
Additions during the period			$ 0.3