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Commitments and Contingencies - Additional Information (Detail) $ in Millions | Sep. 30, 2016 USD ($) LegalMatter | Dec. 31, 2015 USD ($)
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Loss Contingencies [Line Items] |  |
Loss Contingency, Pending Claims, Number | LegalMatter | 4,000 |
Environmental Reserve Other Accrued Costs | $ 18.0 | $ 22.8
Letters of credit outstanding | $ 337.0 | 402.2
Valves And Controls [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Pending Claims, Number | LegalMatter | 3,500 |
Liability For Claims And Contingencies | $ 231.2 | 237.9
Liability Reserve For Insurance Claims | 109.3 | 111.0
Letters of credit outstanding | $ 179.7 | $ 202.3

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- Definition Number of pending claims pertaining to a loss 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 (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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