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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventories consisted of:
(in millions)March 31, 2024December 31, 2023
Materials and supplies$330.5 $320.0 
Natural gas in storage160.0 327.8 
Fossil fuel118.1 127.4 
Total$608.6 $775.2