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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | $ 656.6 | $ 577.7
Group annuity/insurance contracts (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | 23.3 | 22.8
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | 12.5 | 6.9
Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | 285.9 | 258.8
Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | 277.7 | 235.4
Multi-strategy hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | 24.6 | 23.1
Real estate [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension assets | $ 32.6 | $ 30.7

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=82843861&loc=d3e1928-114920 + Details
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