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Commitments and Contingencies - Range of Environmental Liability and Number of Active Sites for Environmental Matters (Detail) - Environmental Related Matters [Member] $ in Millions | Dec. 31, 2015 USD ($) site | Dec. 31, 2014 USD ($) site
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Environmental Matters Range Of Estimated Liability And Active Sites Numbers [Line Items] |  |
High end range | $ | $ 140.6 | $ 160.3
Number of active environmental investigation and remediation sites | site | 49 | 54

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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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