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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 + Details
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