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
	Jan. 31, 2013	Jan. 31, 2012
Pension Plans, Defined Benefit [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 4.2	$ 3.4
Interest cost	6.9	7.4
Expected return on plan assets	(8.1)	(8.5)
Amortization of prior service cost, initial net asset and net actuarial gain	4.2	3.2
Net periodic cost	$ 7.2	$ 5.5