Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($) $ in Millions	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	$ 624.7	$ 650.8	$ 621.2
Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	285.6	303.4
Equity Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	26.7	31.0
Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	20.0	13.7
Money Market Fund [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.6	0.2
Common Collective Trusts [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	128.3	132.5
Government Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	10.0	15.6
Corporate Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	19.7	3.1
Other Assets [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	3.6	0.2
Insurance Annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	130.2	151.1
Level 1 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	171.7	187.9
Level 1 [Member] | Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	124.4	143.0
Level 1 [Member] | Equity Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	26.7	31.0
Level 1 [Member] | Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	20.0	13.7
Level 1 [Member] | Money Market Fund [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	0.6	0.2
Level 2 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	322.8	311.8
Level 2 [Member] | Mutual Funds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	161.2	160.4
Level 2 [Member] | Common Collective Trusts [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	128.3	132.5
Level 2 [Member] | Government Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	10.0	15.6
Level 2 [Member] | Corporate Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	19.7	3.1
Level 2 [Member] | Other Assets [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	3.6	0.2
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	130.2	151.1	$ 96.6
Level 3 [Member] | Insurance Annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	$ 130.2	$ 151.1