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Inventories, Net - Inventories, Net (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Components Of Inventory [Line Items]
Raw materials	$ 103.6	$ 154.8
Work in process	26.1	33.2
Finished products	267.5	397.7
Supplies (chemicals)	65.7	64.6
Total	462.9	650.3
Chemicals
Components Of Inventory [Line Items]
Raw materials	99.7	151.5
Work in process	19.8	27.3
Finished products	265.5	395.6
Component products
Components Of Inventory [Line Items]
Raw materials	3.9	3.3
Work in process	6.3	5.9
Finished products	$ 2.0	$ 2.1

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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