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Inventories, Net - Inventories, Net (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Components Of Inventory [Line Items]    
Raw materials $ 65.3 $ 70.2
Work in process 38.3 24.7
Finished products 245.2 266.3
Inventories, net 417.7 430.6
Chemicals
   
Components Of Inventory [Line Items]    
Raw materials 62.2 66.6
Work in process 28.6 18.0
Finished products 242.9 263.3
Supplies 68.9 69.4
Component Products
   
Components Of Inventory [Line Items]    
Raw materials 3.1 3.6
Work in process 9.7 6.7
Finished products $ 2.3 $ 3.0