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Inventories (Notes)
3 Months Ended
Mar. 31, 2022
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, 2022December 31, 2021
 (in millions)
   
Raw materials and work-in-progress$359.0 $339.7 
Finished goods75.5 89.3 
Gross inventories434.5 429.0 
Inventory valuation reserves(21.8)(18.6)
Inventories, net$412.7 $410.4