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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
June 30, 2017
 
December 31, 2016
 
(in millions)
Finished goods
$
133.4

 
$
151.7

Raw materials and precious metals
90.1

 
98.4

In-process inventories
18.9

 
23.9

Parts and supplies
75.9

 
75.2

Total Inventories
$
318.3

 
$
349.2