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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventory consisted of:
(in millions)September 30, 2021December 31, 2020
Materials and supplies$48.4 $45.8 
Natural gas in storage34.2 18.9 
Fossil fuel14.8 28.0 
Total$97.4 $92.7