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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
June 30, 2016
 
December 31, 2015
 
(in millions)
Finished goods
$
131.8

 
$
114.5

Raw materials and precious metals
102.3

 
81.2

In-process inventories
17.6

 
35.8

Parts and supplies
73.3

 
58.4

Total Inventories
$
325.0

 
$
289.9