Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	$ 650.8	$ 621.2	$ 599.1
Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	303.4	329.4
Equity Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	31.0	33.8
Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	13.7	15.9
Money Market Fund [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.2
Common Collective Trusts [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	132.5	121.5
Government Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	15.6	21.8
Corporate Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	3.1	2.2
Other Assets [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.2
Insurance Annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	151.1	96.6
Level 1 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	187.9	233.4
Level 1 [Member] | Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	143.0	183.7
Level 1 [Member] | Equity Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	31.0	33.8
Level 1 [Member] | Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	13.7	15.9
Level 1 [Member] | Money Market Fund [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.2
Level 2 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	311.8	291.2
Level 2 [Member] | Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	160.4	145.7
Level 2 [Member] | Common Collective Trusts [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	132.5	121.5
Level 2 [Member] | Government Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	15.6	21.8
Level 2 [Member] | Corporate Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	3.1	2.2
Level 2 [Member] | Other Assets [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.2
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	151.1	96.6	87.1
Level 3 [Member] | Insurance Annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	$ 151.1	$ 96.6