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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventory consisted of:
(in millions)June 30, 2023December 31, 2022
Materials and supplies$283.7 $257.0 
Natural gas in storage212.1 446.3 
Fossil fuel107.9 103.8 
Total$603.7 $807.1