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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 522.1 | $ 519.2 | $ 503.5
Foreign Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 368.2 | 415.1 | $ 417.0
Equity securities | U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 302.2 | 317.7 |
Equity securities | Foreign Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 211.5 | 238.9 |
Debt securities | U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 130.8 | 137.9 |
Debt securities | Foreign Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 115.2 | 136.8 |
Alternative investments | U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 53.0 | 53.7 |
Alternative investments | Foreign Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 34.0 | 33.1 |
Cash and other | U.S. Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 36.1 | 9.9 |
Cash and other | Foreign Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 7.5 | $ 6.3 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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