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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventory consisted of:
(in millions)June 30, 2020December 31, 2019
Materials and supplies$240.2  $234.2  
Natural gas in storage142.5  227.7  
Fossil fuel85.0  87.9  
Total$467.7  $549.8