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Inventories, net - Inventories, Net (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Components Of Inventory [Line Items]
Raw materials	$ 94.2	$ 154.8
Work in process	33.7	33.2
Finished products	350.6	397.7
Supplies (chemicals)	65.5	64.6
Total	544.0	650.3
Chemicals [Member]
Components Of Inventory [Line Items]
Raw materials	90.5	151.5
Work in process	27.6	27.3
Finished products	348.4	395.6
Component Products [Member]
Components Of Inventory [Line Items]
Raw materials	3.7	3.3
Work in process	6.1	5.9
Finished products	$ 2.2	$ 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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