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Revenue Recognition
 9 Months Ended
Sep. 30, 2020
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. As our revenues are primarily earned over a period of time and we do not earn a material amount of revenues at a point in time, revenues are not disaggregated as such below. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, Indiana and Massachusetts. The sale of the Massachusetts Business was completed on October 9, 2020. Refer to Note 6, "Assets and Liabilities Held for Sale," for further details. 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, 2020 and September 30, 2019:
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 Revenues(2)
15.8 25.2 — 41.0 
Total Operating Revenues$470.1 $432.2 $0.2 $902.5 
(1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.
(2) Other revenues represent revenue earned under alternative revenue programs.
Three Months Ended September 30, 2019
(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Customer Revenues(1)
Residential$288.3 $148.7 $— $437.0 
Commercial90.9 136.3 — 227.2 
Industrial45.3 151.5 — 196.8 
Off-system16.9 — — 16.9 
Miscellaneous9.8 3.1 0.2 13.1 
Total Customer Revenues$451.2 $439.6 $0.2 $891.0 
Other Revenues(2)
12.4 28.1 — 40.5 
Total Operating Revenues$463.6 $467.7 $0.2 $931.5 
(1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.
(2) Other revenues represent revenue earned under alternative revenue programs.
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 Revenues(2)
79.5 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 21, "Business Segment Information," for discussion of intersegment revenues.
(2) Other revenues represent revenue earned under alternative revenue programs.
Nine Months Ended September 30, 2019
(in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Customer Revenues(1)
Residential$1,638.6 $373.4 $— $2,012.0 
Commercial543.2 370.7 — 913.9 
Industrial181.1 470.6 — 651.7 
Off-system60.4 — — 60.4 
Miscellaneous39.4 16.7 0.6 56.7 
Total Customer Revenues$2,462.7 $1,231.4 $0.6 $3,694.7 
Other Revenues(2)
43.5 73.5 — 117.0 
Total Operating Revenues$2,506.2 $1,304.9 $0.6 $3,811.7 
(1) Customer revenue amounts exclude intersegment revenues. See Note 21, "Business Segment Information," for discussion of intersegment revenues.
(2) Other revenues represent revenue earned under alternative revenue programs.
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. The opening and closing balances of customer receivables for the nine months ended September 30, 2020 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, 2019$466.6 $346.6 
Balance as of September 30, 2020291.0 178.8 
Decrease$(175.6)$(167.8)
Utility revenues are billed to customers monthly on a cycle basis. We generally expect that substantially all customer accounts receivable will be collected within the month following customer billing, as this revenue consists primarily of monthly, 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. In connection with COVID-19, 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 in rates. While several of these moratoriums remain in place, we have reinstated our common credit mitigation practices where moratoriums have expired (see Note 9, "Regulatory Matters," for additional information on regulatory moratoriums and regulatory assets). 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. We adopted ASC 326 effective January 1, 2020. See "Recently Adopted Accounting Pronouncements" in Note 2, "Recent Accounting Pronouncements," for more information about ASC 326.
Each of our business segments pool their customer accounts receivables based on similar risk characteristics, such as customer type, geography, payment terms, and related macro-economic risks. Expected credit loss exposure is evaluated separately for each of our accounts receivable pools. Expected credit losses are established using a model that considers historical collections experience, current information, and reasonable and supportable forecasts. Relevant and reliable internal and external inputs used in the model include, but are not limited to, energy consumption trends, revenue projections, actual charge-offs data, recoveries data, shut-off orders executed data, and final bill data. We continuously evaluate available reasonable and supportable information relevant to assessing collectability of current and future receivables. We evaluate creditworthiness of specific customers periodically or when required by 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; these include, but are 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 using an allowance for credit losses account. When deemed to be uncollectible, customer accounts are written-off. A rollforward of our allowance for credit losses for the three and nine months ended September 30, 2020 are presented in the tables below:

Three Months Ended September 30, 2020 (in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Beginning balance$25.4 $5.2 $0.8 $31.4 
Current period provisions8.2 2.3 — 10.5 
Write-offs charged against allowance(4.3)(0.5)— (4.8)
Recoveries of amounts previously written off2.2 — — 2.2 
Ending balance of the allowance for credit losses$31.5 $7.0 $0.8 $39.3 
Nine Months Ended September 30, 2020 (in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Beginning balance(1)
9.1 3.1 0.8 13.0 
Current period provisions30.6 6.7 — 37.3 
Write-offs charged against allowance(18.1)(3.0)— (21.1)
Recoveries of amounts previously written off9.9 0.2 — 10.1 
Ending balance of the allowance for credit losses31.5 7.0 0.8 39.3 
(1)Total beginning balance differs from that presented in the Condensed Statements of Consolidated Balance Sheet (unaudited) as it excludes Columbia of Massachusetts. Columbia of Massachusetts' customer receivables and related allowance for credit losses are classified as held for sale at September 30, 2020.
As of September 30, 2020, we have also evaluated the adequacy of our allowance for credit losses in light of the suspension of shut-offs for nonpayment due to COVID-19 that remain in effect for certain jurisdictions, as well as the economic downturn. Our evaluation included an analysis of customer payment trends in 2020, economic conditions, receivables aging, and considerations of past economic downturns and corresponding allowance for credit losses and customer account write-offs. In addition, 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 COVID-19, which could help to mitigate the potential for increasing customer account delinquencies. Based upon this evaluation, we have concluded that the allowance for credit losses as of September 30, 2020 adequately reflected the collection risk and net realizable value for our receivables. We will continue to monitor changing circumstances and will adjust our allowance for credit losses as additional information becomes available.