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INVENTORIES
6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
INVENTORIES
NOTE 7. INVENTORIES
Inventories consisted of the following:
 June 30, 2024December 31,
2023
June 30, 2023
Inventories($ in millions)
Supplies$151.8 $160.3 $145.1 
Raw materials195.3 171.1 181.6 
Work in process164.3 153.5 202.5 
Finished goods527.6 507.6 725.8 
Inventories excluding LIFO reserve1,039.0 992.5 1,255.0 
LIFO reserve(166.1)(133.7)(173.8)
Inventories, net$872.9 $858.8 $1,081.2 
Inventories under the LIFO method are based on annual estimates of quantities and costs as of year-end; therefore, the condensed financial statements at June 30, 2024 reflect certain estimates relating to inventory quantities and costs at December 31, 2024. The replacement cost of our inventories would have been approximately $166.1 million, $133.7 million and $173.8 million higher than reported at June 30, 2024, December 31, 2023 and June 30, 2023, respectively.