XML 51 R39.htm IDEA: XBRL DOCUMENT v3.21.1
MATERIALS, SUPPLIES, AND INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory
Our inventory consisted of:
(in millions)March 31, 2021December 31, 2020
Materials and supplies$218.3 $218.1 
Natural gas in storage68.3 224.9 
Fossil fuel66.9 85.6 
Total$353.5 $528.6