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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
(5) Inventories

Inventories consisted of the following:
 
December 31,
 
2017
 
2016
 
(in millions)
Finished goods
$
172.0

 
$
151.7

Raw materials and precious metals
113.8

 
98.4

In-process inventories
22.4

 
23.9

Parts and supplies
77.0

 
75.2

     Total Inventories
$
385.2

 
$
349.2