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Inventories (Tables)
12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
December 31,
 
2014
 
2013
 
(in millions)
Finished goods
$
7.8

 
$
3.3

Materials and supplies
1.8

 
2.6

Total
$
9.6

 
$
5.9