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Inventories (Notes)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
4. 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: 
 June 30, 2020December 31, 2019
 (in millions)
   
Raw materials and work-in-progress$305.5  $310.4  
Finished goods81.1  83.7  
Gross inventories386.6  394.1  
Inventory valuation reserves(28.1) (20.5) 
Inventories, net$358.5  $373.6