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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2025
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventories consisted of:
(in millions)June 30, 2025December 31, 2024
Materials and supplies$399.4 $412.5 
Natural gas in storage209.9 300.2 
Fossil fuel93.7 100.5 
Total$703.0 $813.2