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

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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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.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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Amount of gain (loss) from translating a restructuring reserve to the currency of the reporting entity from an amount denominated or measured in a different currency.

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