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Inventories (Tables)
 6 Months Ended
Jun. 30, 2014
Inventories  
Schedule of inventories

  June 30,
2014		   December 31,
2013		  
 
   (in millions)
  

Materials and supplies

   $ 3.0   $ 2.6  

Finished goods

     4.8     3.3  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 7.8   $ 5.9  
           
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