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Inventories, Net
9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Inventories, Net Inventories, Net
 
Inventories, net 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 unplanned 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 based on its judgment of future realization. These reviews require the Company to assess customer and market demand. There were no material inventory write-offs during the three and nine months ended September 30, 2025 and 2024.

The following table summarizes inventories by major class (in millions):    
September 30, 2025December 31, 2024
Raw materials$118.1 $125.8 
Work in process55.7 53.5 
Finished goods143.2 160.7 
Supplies and other13.3 15.1 
Total inventories$330.3 $355.1