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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventory consisted of:
(in millions)June 30, 2021December 31, 2020
Materials and supplies$218.9 $218.1 
Natural gas in storage162.1 224.9 
Fossil fuel71.7 85.6 
Total$452.7 $528.6