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Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
September 30, 2017
 
December 31, 2016
 
(in millions)
Finished goods
$
141.2

 
$
151.7

Raw materials and precious metals
100.3

 
98.4

In-process inventories
20.9

 
23.9

Parts and supplies
77.3

 
75.2

Total Inventories
$
339.7

 
$
349.2