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Pension Assets by Major Category of Plan Assets and Type of Fair Value Measurement (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	$ 583.8	$ 536.8
Group annuity/insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	21.2	20.6
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	8.1	6.3
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	278.6	331.5
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	232.6	135.2
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	20.5	18.8
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	22.8	24.4
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	519.3	473.0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	8.1	6.3
Level 2 | Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	278.6	331.5
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	232.6	135.2
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	64.5	63.8
Level 3 | Group annuity/insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	21.2	20.6
Level 3 | Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	20.5	18.8
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	$ 22.8	$ 24.4

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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