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Revenue Recognition
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer Revenue RecognitionRevenue Disaggregation and Reconciliation. We disaggregate revenue from contracts with customers based upon reportable segment, as well as by customer class. The Gas Distribution Operations segment provides natural gas service and transportation
for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, and Indiana. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.
The tables below reconcile revenue disaggregation by customer class to segment revenue, as well as to revenues reflected on the Condensed Statements of Consolidated Income (Loss) (unaudited) for the three and nine months ended September 30, 2021 and September 30, 2020:
Three Months Ended September 30, 2021
(in millions)
Gas Distribution OperationsElectric Operations
Corporate and Other(2)
Total
Customer Revenues(1)
Residential$304.3 $178.7 $— $483.0 
Commercial99.2 151.6 — 250.8 
Industrial41.0 125.7 — 166.7 
Off-system14.5 — — 14.5 
Miscellaneous4.6 (1.0)0.2 3.8 
Total Customer Revenues$463.6 $455.0 $0.2 $918.8 
Other Revenues8.7 23.9 8.0 40.6 
Total Operating Revenues$472.3 $478.9 $8.2 $959.4 
(1)Customer revenue amounts exclude intersegment revenues. See Note 18, "Business Segment Information," for discussion of intersegment revenues.
(2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Three Months Ended September 30, 2020
(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Customer Revenues(1)
Residential$306.9 $164.8 $— $471.7 
Commercial91.8 132.3 — 224.1 
Industrial42.8 102.7 — 145.5 
Off-system6.0 — — 6.0 
Miscellaneous6.8 7.2 0.2 14.2 
Total Customer Revenues$454.3 $407.0 $0.2 $861.5 
Other Revenues15.8 25.2 — 41.0 
Total Operating Revenues$470.1 $432.2 $0.2 $902.5 
(1)Customer revenue amounts exclude intersegment revenues. See Note 18, "Business Segment Information," for discussion of intersegment revenues.
Nine Months Ended September 30, 2021
(in millions)
Gas Distribution OperationsElectric Operations
Corporate and Other(2)
Total
Customer Revenues(1)
Residential$1,456.5 $439.8 $— $1,896.3 
Commercial496.0 404.4 — 900.4 
Industrial142.9 367.7 — 510.6 
Off-system46.0 — — 46.0 
Miscellaneous19.2 4.6 0.6 24.4 
Total Customer Revenues$2,160.6 $1,216.5 $0.6 $3,377.7 
Other Revenues21.8 68.4 23.1 113.3 
Total Operating Revenues$2,182.4 $1,284.9 $23.7 $3,491.0 
(1)Customer revenue amounts exclude intersegment revenues. See Note 18, "Business Segment Information," for discussion of intersegment revenues.
(2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Nine Months Ended September 30, 2020
(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Customer Revenues(1)
Residential$1,518.1 $411.5 $— $1,929.6 
Commercial483.9 365.4 — 849.3 
Industrial165.6 301.1 — 466.7 
Off-system32.7 — — 32.7 
Miscellaneous24.6 16.6 0.6 41.8 
Total Customer Revenues$2,224.9 $1,094.6 $0.6 $3,320.1 
Other Revenues79.5 71.1 — 150.6 
Total Operating Revenues$2,304.4 $1,165.7 $0.6 $3,470.7 
(1)Customer revenue amounts exclude intersegment revenues. See Note 18, "Business Segment Information," for discussion of intersegment revenues.
Customer Accounts Receivable. Accounts receivable on our Condensed Consolidated Balance Sheets (unaudited) includes both billed and unbilled amounts, as well as certain amounts that are not related to customer revenues. Unbilled amounts of accounts receivable relate to a portion of a customer’s consumption of gas or electricity from the date of the last cycle billing through the last day of the month (balance sheet date). Factors taken into consideration when estimating unbilled revenue include historical usage, customer rates and weather. A significant portion of our operations are subject to seasonal fluctuations in sales. During the heating season, primarily from November through March, revenues and receivables from gas sales are more significant than in other months. The opening and closing balances of customer receivables for the nine months ended September 30, 2021 are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.
(in millions)Customer Accounts Receivable, Billed (less reserve)Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020$400.0 $327.2 
Balance as of September 30, 2021272.7 204.5 
Utility revenues are billed to customers monthly on a cycle basis. We expect that substantially all customer accounts receivable will be collected following customer billing, as this revenue consists primarily of periodic, tariff-based billings for service and usage. We maintain common utility credit risk mitigation practices, including requiring deposits and actively pursuing collection of past due amounts. Our regulated operations also utilize certain regulatory mechanisms that facilitate recovery of bad debt costs within tariff-based rates, which provides further evidence of collectibility. It is probable that substantially all of the consideration to which we are entitled from customers will be collected upon satisfaction of performance obligations.
Allowance for Credit Losses. To evaluate for expected credit losses, customer account receivables are pooled based on similar risk characteristics, such as customer type, geography, payment terms, and related macro-economic risks. Expected credit losses are established using a model that considers historical collections experience, current information, and reasonable and supportable forecasts. Internal and external inputs are used in our credit model including, but not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-offs, and final bill data. We continuously evaluate available information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or following changes in facts and circumstances. When we become aware of a specific commercial or industrial customer's inability to pay, an allowance for expected credit losses is recorded for the relevant amount. We also monitor other circumstances that could affect our overall expected credit losses including, but not limited to, creditworthiness of overall population in service territories, adverse conditions impacting an industry sector, and current economic conditions.
At each reporting period, we record expected credit losses to an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses as of September 30, 2021 and December 31, 2020 are presented in the table below:

(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Balance as of January 1, 2021$41.8 $9.7 $0.8 $52.3 
Current period provisions7.7 (0.6)— 7.1 
Write-offs charged against allowance(34.7)(6.2)— (40.9)
Recoveries of amounts previously written off9.4 0.4 — 9.8 
Balance as of September 30, 2021$24.2 $3.3 $0.8 $28.3 
(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Balance as of January 1, 2020$9.1 $3.1 $0.8 $13.0 
Current period provisions45.3 9.3 — 54.6 
Write-offs charged against allowance(26.7)(3.0)— (29.7)
Recoveries of amounts previously written off14.1 0.3 — 14.4 
Balance as of December 31, 2020$41.8 $9.7 $0.8 $52.3 
In connection with the COVID-19 pandemic, certain state regulatory commissions instituted regulatory moratoriums that impacted our ability to pursue our standard credit risk mitigation practices. Following the issuance of these moratoriums, certain of our regulated operations have been authorized to recognize a regulatory asset for bad debt costs above levels currently recovered in rates. At the balance sheet date, in addition to our evaluation of the allowance for credit losses discussed above, we considered benefits available under governmental COVID-19 relief programs, the impact of unemployment benefits initiatives, and flexible payment plans being offered to customers affected by or experiencing hardship as a result of the pandemic, which could help to mitigate the potential for increasing customer account delinquencies. We also considered the on-time bill payment promotion and robust customer marketing strategy for energy assistance programs that we have implemented. Based upon this evaluation, we have concluded that the allowance for credit losses as of September 30, 2021 adequately reflected the collection risk and net realizable value for our receivables. We have now resumed our common credit mitigation practices in all jurisdictions as all moratoriums have expired (see Note 7, "Regulatory Matters," for additional information on regulatory moratoriums and regulatory assets).