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Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
March 31, 2017
 
December 31, 2016
 
(in millions)
Finished goods
$
146.3

 
$
151.7

Raw materials and precious metals
94.1

 
98.4

In-process inventories
38.9

 
23.9

Parts and supplies
74.6

 
75.2

Total Inventories
$
353.9

 
$
349.2