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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Oct. 31, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	$ 599.1	$ 540.3
Equity securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	224.0	227.3
Fixed income [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	188.3	151.7
Debt securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	56.8	28.1
Insurance annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	99.3	87.9
Other [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	30.7	45.3
Level 1 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	111.8	171.7
Level 1 [Member] \| Equity securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	7.7	78.0
Level 1 [Member] \| Fixed income [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	89.0	75.9
Level 1 [Member] \| Debt securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 1 [Member] \| Insurance annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 1 [Member] \| Other [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	15.1	17.8
Level 2 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	388.0	280.7
Level 2 [Member] \| Equity securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	216.3	149.3
Level 2 [Member] \| Fixed income [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	99.3	75.8
Level 2 [Member] \| Debt securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	56.8	28.1
Level 2 [Member] \| Insurance annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 2 [Member] \| Other [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	15.6	27.5
Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	99.3	87.9
Level 3 [Member] \| Equity securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 3 [Member] \| Fixed income [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 3 [Member] \| Debt securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets
Level 3 [Member] \| Insurance annuity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets	99.3	87.9
Level 3 [Member] \| Other [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Fair value of plan assets

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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