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Inventories
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
6.
INVENTORIES

We state our inventories at the lower of cost or net realizable value.  The cost of our inventories is determined using the first-in first-out method.  When we determine that our gross inventories exceed usage requirements, or if inventories become obsolete or otherwise not saleable, we record a provision for such loss as a component of our inventory accounts.

Inventories consist of the following: 
 
 
September 30, 2018
 
December 31, 2017
 
 
(in millions)
 
 
 
 
 
Raw materials and work-in-progress
 
$
388.1

 
$
319.7

Finished goods
 
73.0

 
89.6

Gross inventories
 
461.1

 
409.3

Inventory valuation reserves
 
(17.5
)
 
(17.3
)
Inventories, net
 
$
443.6

 
$
392.0