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Inventories, net (Tables)
9 Months Ended
Sep. 30, 2012
Inventories, net  
Schedule of inventories

 

 
  September 30,
2012
  December 31,
2011
 
 
  (in millions)
 

Materials, spare parts and supplies

  $ 10.3   $ 13.9  

Finished goods

    3.0     3.4  
           

Total

  $ 13.3   $ 17.3