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Inventories, Net - Inventories, Net (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Components Of Inventory [Line Items]    
Raw materials $ 70.2 $ 154.8
Work in process 24.7 33.2
Finished products 266.3 397.7
Supplies (chemicals) 69.4 64.6
Inventories, net 430.6 650.3
Chemicals
   
Components Of Inventory [Line Items]    
Raw materials 66.6 151.5
Work in process 18.0 27.3
Finished products 263.3 395.6
Component Products
   
Components Of Inventory [Line Items]    
Raw materials 3.6 3.3
Work in process 6.7 5.9
Finished products $ 3.0 $ 2.1