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MATERIALS, SUPPLIES, AND INVENTORIES
 6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
MATERIALS, SUPPLIES, AND INVENTORIES MATERIALS, SUPPLIES, AND INVENTORIES
Our inventories consisted of:
(in millions)June 30, 2024December 31, 2023
Materials and supplies$86.7 $79.9 
Fossil fuel43.4 52.1 
Natural gas in storage29.4 39.1 
Total$159.5 $171.1 

Substantially all materials and supplies, fossil fuel, and natural gas in storage inventories are recorded using the weighted-average cost method of accounting.