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Employee Benefit Plans - Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Level 3 - Defined Benefit Pension Plans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Fair value at beginning of year | $ 236.2 | $ 254.1
Gain on assets held at end of year | 4.1 | 6.5
Gain on assets sold during the year |  | 0.3
Assets purchased | 13.1 | 13.7
Assets sold | (13.4) | (12.4)
Currency exchange rate fluctuations | (9.5) | (26.0)
Fair value at end of year | $ 230.5 | $ 236.2

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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