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Inventories
9 Months Ended
Sep. 30, 2019
Inventory, Net [Abstract]  
Inventories
Inventories

Inventories consist of the following:
 
September 30, 2019
 
December 31, 2018
Raw materials
$
88.4

 
$
100.7

Work-in-process
50.7

 
49.5

Finished goods
36.2

 
47.3

Operating and other supplies
147.0

 
146.3

Total inventories
$
322.3

 
$
343.8


Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out ("FIFO") or the weighted average cost method.