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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventories consisted of:
(in millions)September 30, 2023December 31, 2022
Natural gas in storage$353.2 $446.3 
Materials and supplies301.7 257.0 
Fossil fuel95.0 103.8 
Total$749.9 $807.1