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INVENTORIES
3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
INVENTORIES
NOTE 7. INVENTORIES
Inventories consisted of the following:
 March 31, 2024December 31,
2023
March 31, 2023
Inventories($ in millions)
Supplies$146.7 $160.3 $140.0 
Raw materials188.2 171.1 193.5 
Work in process160.8 153.5 211.4 
Finished goods473.9 507.6 721.8 
Inventories excluding LIFO reserve969.6 992.5 1,266.7 
LIFO reserve(145.7)(133.7)(176.8)
Inventories, net$823.9 $858.8 $1,089.9 
Inventories under the LIFO method are based on annual estimates of quantities and costs as of year-end; therefore, the condensed financial statements at March 31, 2024 reflect certain estimates relating to inventory quantities and costs at December 31, 2024. The replacement cost of our inventories would have been approximately $145.7 million, $133.7 million and $176.8 million higher than reported at March 31, 2024, December 31, 2023 and March 31, 2023, respectively.