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Inventories (Notes)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]
3. 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: 
 March 31, 2021December 31, 2020
 (in millions)
   
Raw materials and work-in-progress$296.3 $276.2 
Finished goods65.6 70.4 
Gross inventories361.9 346.6 
Inventory valuation reserves(23.8)(23.4)
Inventories, net$338.1 $323.2