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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Schedule of Inventories
                 
    December 31,
2011
    June 30,
2012
 
    (In millions)  

Raw materials

  $ 89.6     $ 208.9  

Work in process

    17.3       16.1  

Finished products

    280.7       357.2  

Supplies

    56.6       59.1  
   

 

 

   

 

 

 
     

Total

  $ 444.2     $ 641.3