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Inventories
6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories are valued at the lower of cost (using the first-in, first-out and weighted average methods) or net realizable value. The Company's costs included in inventory primarily include resins, pulp, chemicals, direct labor, utilities, maintenance, depreciation, finishing supplies and an allocation of certain overhead costs. Machine start-up costs or abnormal machine shutdowns are expensed in the period incurred and are not reflected in inventory. The Company reviews inventories at least quarterly to determine the necessity of write-offs for excess, obsolete or unsalable inventory. The Company estimates write-offs for inventory obsolescence and shrinkage. These reviews require the Company to assess customer and market demand.

The following table details inventories by major class (in millions):
June 30,
2022
December 31,
2021
Raw materials$114.5 $113.4 
Work in process43.9 41.9 
Finished goods108.9 95.7 
Supplies and other9.1 8.5 
Total inventories$276.4 $259.5