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Restructuring Costs - Summary of Activity in Accrued Workforce Reduction (Detail) - Jun. 30, 2015 - USD ($) $ in Millions | Total | Total
--- | --- | ---
Amounts recognized in the balance sheet: |  |
Accrued workforce reduction costs | $ 18.3 | $ 18.3
Accrued workforce reduction costs | 2.9 | 2.9
Chemicals |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring charges | 21.1 |
Chemicals | Employee Severance |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring charges | 21.1 | 21.1
Workforce reduction costs paid |  | (0.4)
Currency translation adjustments, net |  | 0.5
Accrued workforce reduction costs at June 30, 2015 | 21.2 | 21.2
Amounts recognized in the balance sheet: |  |
Accrued workforce reduction costs | 18.3 | 18.3
Accrued workforce reduction costs | 2.9 | 2.9
Restructuring Reserve | $ 21.2 | $ 21.2

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