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Inventories (Tables)
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
March 31, 2016
 
December 31, 2015
 
(in millions)
Finished goods
$
95.8

 
$
114.5

Raw materials and precious metals
83.1

 
81.2

In-process inventories
21.2

 
35.8

Parts and supplies
59.3

 
58.4

Total Inventories
$
259.4

 
$
289.9