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Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) - Liability [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Environmental Liability And Related Assets [Line items] |  |
Changes In Pre-Existing Environmental Accruals | $ 8.8 | $ 5.9
Environmental Related Matters [Member] |  |
Environmental Liability and Related Assets [Roll Forward] |  |
Environmental liability - Beginning balance | 76.6 | 82.6
Net cash activity, Liability | (11.7) | (11.9)
Foreign currency, Liability | 0.2 |
Environmental liability - Ending balance | $ 73.9 | $ 76.6

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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