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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, 2015 | Dec. 31, 2015
Amounts recognized in our Consolidated Balance Sheet at the end of the period: |  |  |  |  |
Current liability |  |  |  |  | $ 5.3
Chemicals | Employee Severance |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Workforce reduction costs accrued | $ 0.2 | $ 0.4 | $ 21.1 | $ 21.7 |
Workforce reduction costs paid |  |  |  | (15.9) |
Currency translation adjustments, net |  |  |  | (0.2) |
Accrued workforce reduction costs, ending balance | 5.6 |  |  | 5.6 |
Amounts recognized in our Consolidated Balance Sheet at the end of the period: |  |  |  |  |
Current liability |  |  |  |  | 5.3
Noncurrent liability |  |  |  |  | 0.3
Restructuring Reserve | $ 5.6 |  |  | $ 5.6 | $ 5.6

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