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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Schedule of Inventories
Inventories consist of the following:
June 30, 2018
 
December 31, 2017
Raw materials
$
125.8

 
$
106.2

Work-in-process
55.9

 
49.6

Finished goods
42.3

 
40.9

Operating and other supplies
139.0

 
120.8

Total inventories
$
363.0

 
$
317.5