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Inventories
12 Months Ended
Dec. 31, 2018
Inventory, Net [Abstract]  
Inventories
Inventories
Inventories, at December 31, consist of the following:
 
 
2018
 
2017
Raw materials
$
100.8

 
$
106.2

Work-in-process
49.5

 
49.6

Finished goods
47.3

 
40.9

Operating and other supplies
146.2

 
120.8

Inventories
$
343.8

 
$
317.5