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Restructuring Costs - Summary of Activity in Accrued Workforce Reduction (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized in the balance sheet: |  |  |  |  |  |  |
Current liability |  |  |  |  |  | $ 1.2 | $ 5.3
Chemicals | Employee Severance |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Balance at beginning of the year |  |  |  | $ 5.6 |  |  |
Workforce reduction costs accrued | $ 0.2 | $ 0.4 | $ 21.1 |  | $ 21.7 |  |
Workforce reduction costs paid |  |  |  | (4.1) | (15.9) |  |
Currency translation adjustments, net |  |  |  | (0.1) | (0.2) |  |
Balance at end of the year | 5.6 |  |  | 1.4 | 5.6 |  |
Amounts recognized in the balance sheet: |  |  |  |  |  |  |
Current liability |  |  |  |  |  | 1.2 | 5.3
Noncurrent liability |  |  |  |  |  | 0.2 | 0.3
Restructuring Reserve | $ 5.6 |  |  | $ 5.6 | $ 5.6 | $ 1.4 | $ 5.6

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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