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MATERIALS, SUPPLIES, AND INVENTORIES
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
MATERIALS, SUPPLIES, AND INVENTORIES MATERIALS, SUPPLIES, AND INVENTORIES
Our inventory consisted of:
(in millions)March 31, 2023December 31, 2022
Materials and supplies$67.1 $59.3 
Fossil fuel47.9 40.2 
Natural gas in storage25.2 65.0 
Total$140.2 $164.5 
Substantially all materials and supplies, fossil fuel, and natural gas in storage inventories are recorded using the weighted-average cost method of accounting.