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Defined Benefit Plans - Pension Assets by Major Category of Plan Assets and Type of Fair Value Measurement (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	$ 561.9	$ 608.2
Group annuity/insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	22.3	21.8
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	5.8	9.1
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	249.1	282.6
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	233.8	248.0
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	22.3	21.6
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	28.6	25.1
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	488.7	539.7
Level 2 [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	5.8	9.1
Level 2 [Member] | Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	249.1	282.6
Level 2 [Member] | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	233.8	248.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	73.2	68.5
Level 3 | Group annuity/insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	22.3	21.8
Level 3 | Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	22.3	21.6
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value asset measurements	$ 28.6	$ 25.1

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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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: 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=58740216&loc=d3e1928-114920

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