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 shut downs 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. The following schedule details inventories by major class ($ in millions):



	March 31, 2019		December 31, 2018
Raw materials	$	54.0	$	50.2
Work in process	23.8		22.4
Finished goods	67.4		69.9
Supplies and other	9.3		9.0
Total	$	154.5	$	151.5