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Inventories, Net - Inventories, Net (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials	$ 80.0	$ 79.4
Work in process	43.7	43.2
Finished products	231.7	256.4
Supplies	58.4us-gaap_InventorySuppliesNetOfReserves	64.0us-gaap_InventorySuppliesNetOfReserves
Total	413.8us-gaap_InventoryNet	443.0us-gaap_InventoryNet
Chemicals
Inventory [Line Items]
Raw materials	76.7	76.0
Work in process	33.0	32.9
Finished products	228.9	253.2
Component Products
Inventory [Line Items]
Raw materials	3.3	3.4
Work in process	10.7	10.3
Finished products	$ 2.8	$ 3.2

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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