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Inventories
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following:
 
June 30,
2015
 
December 31,
2014
 
(in millions)
Finished goods
$
6.1

 
$
7.8

Materials and supplies
3.3

 
1.8

Total
$
9.4

 
$
9.6