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Inventories (Tables)
 3 Months Ended
Mar. 31, 2014
Inventories  
Schedule of inventories

 

 

 
   March 31,
2014		   December 31,
2013		  
 
   (in millions)
  

Materials and supplies

   $ 3.0   $ 2.6  

Finished goods

     2.4     3.3  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 5.4   $ 5.9  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​