Retirement Plans and Postretirement Health Care and Life Insurance Benefits - Components of Net Periodic Pension Cost (Detail) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.9	$ 4.2	$ 11.7	$ 12.6
Interest cost	7.4	6.9	22.2	20.7
Expected return on plan assets	(8.5)	(8.1)	(25.5)	(24.3)
Amortization of prior service cost, initial net asset and net actuarial gain	2.7	4.2	8.1	12.6
Net periodic pension costs	$ 5.5	$ 7.2	$ 16.5	$ 21.6