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Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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United States Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Projected benefit obligation | $ 56.0 | $ 54.0
Accumulated benefit obligation | 51.6 | 48.0
Foreign Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Projected benefit obligation | 39.4 | 34.3
Accumulated benefit obligation | 34.7 | 30.1
Fair value of plan assets | $ 1.3 | $ 1.1

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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