MATERIALS, SUPPLIES, AND INVENTORIES

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

MATERIALS, SUPPLIES, AND INVENTORIES

MATERIALS, SUPPLIES, AND INVENTORIES

Our inventory consisted of:

(in millions)	June 30, 2021		December 31, 2020
Materials and supplies	$	135.8	$	136.5
Fossil fuel	45.8		57.1
Natural gas in storage	27.5		25.9
Total	$	209.1	$	219.5

Substantially all materials and supplies, fossil fuel inventories, and natural gas in storage are recorded using the weighted-average cost method of accounting.