Post Retirement Benefit Plans - Reconciliation of Beginning and Ending Balances of Fair Value Measurements Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Balance at beginning of year	$ 650.8	$ 621.2
Actual return on plan assets held at reporting date:
Plan participant contributions	0.2	0.3
Currency impact	(27.3)	(10.0)
Balance at end of year	624.7	650.8
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Balance at beginning of year	151.1	96.6
Actual return on plan assets held at reporting date:
Assets still held at reporting date	7.1	15.9
Plan participant contributions		0.3
Net purchases (settlements)		47.0
Transfers	(3.4)
Currency impact	(24.6)	(8.7)
Balance at end of year	$ 130.2	$ 151.1