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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:
 
March 31, 2018
 
December 31, 2017
 
(in millions)
Finished goods
$
177.5

 
$
172.0

Raw materials and precious metals
133.6

 
113.8

In-process inventories
36.3

 
22.4

Parts and supplies
77.0

 
77.0

Total Inventories
$
424.4

 
$
385.2