XML 20 R19.htm IDEA: XBRL DOCUMENT
v3.20.1

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the difference between current projected replacement cost and the LIFO cost for quantities of natural gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation debit or credit.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.

X
- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
Name: | us-gaap_InventoryDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration