Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Restructuring charges	$ 13.3	$ 5.6	$ 40.0	$ 16.1	$ 4.8
Asset impairment charges	23.6	70.2	45.9	85.8	31.4
Gain (loss) on disposal of properties, plants and equipment, net	(2.3)	2.8	7.0	8.3	$ 5.6
Gain (loss) on disposal of businesses, net	$ (0.7)	$ 21.2	$ (9.2)	$ 11.5