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Inventories, Net - Inventories, Net (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Components Of Inventory [Line Items]    
Raw materials $ 70.4 $ 70.2
Work in process 31.5 24.7
Finished products 250.0 266.3
Inventories, net 420.9 430.6
Chemicals
   
Components Of Inventory [Line Items]    
Raw materials 67.6 66.6
Work in process 21.9 18.0
Finished products 247.3 263.3
Supplies 69.0 69.4
Component products
   
Components Of Inventory [Line Items]    
Raw materials 2.8 3.6
Work in process 9.6 6.7
Finished products $ 2.7 $ 3.0