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Inventories (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
September 30, 2014
 
December 31, 2013
 
(in millions)
Finished goods
$
273.2

 
$
268.2

Raw materials and precious metals
165.0

 
177.0

In-process inventories
33.6

 
36.9

Parts and supplies
45.0

 
44.5

 
$
516.8

 
$
526.6