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Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials	$ 90.2	$ 79.4
Work in process	35.1	43.2
Finished products	217.3	256.4
Supplies	61.1	64.0
Total	403.7	443.0
Chemicals
Inventory [Line Items]
Raw materials	86.9	76.0
Work in process	25.2	32.9
Finished products	215.0	253.2
Component Products
Inventory [Line Items]
Raw materials	3.3	3.4
Work in process	9.9	10.3
Finished products	$ 2.3	$ 3.2

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