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MATERIALS, SUPPLIES, AND INVENTORIES
 3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
MATERIALS, SUPPLIES, AND INVENTORIES MATERIALS, SUPPLIES, AND INVENTORIES

Our inventory consisted of:
(in millions)
 
March 31, 2020
 
December 31, 2019
Materials and supplies
 
230.7

 
234.2

Fossil fuel
 
92.5

 
87.9

Natural gas in storage
 
67.9

 
227.7

Total
 
$
391.1

 
$
549.8



PGL and NSG price natural gas storage injections at the calendar year average of the costs of natural gas supply purchased. Withdrawals from storage are priced on the LIFO cost method. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of natural gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation debit or credit. At March 31, 2020, we had a temporary LIFO liquidation debit of $11.3 million recorded within other current assets on our balance sheet. Due to seasonality requirements, PGL and NSG expect these interim reductions in LIFO layers to be replenished by year end.

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