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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
June 30, 2015
 
December 31, 2014
 
(in millions)
Finished goods
$
158.2

 
$
176.2

Raw materials and precious metals
124.1

 
88.0

In-process inventories
18.5

 
20.6

Parts and supplies
48.7

 
44.8

 
$
349.5

 
$
329.6