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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | 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 Operations |  | Electric Operations |  | Corporate and Other(2) |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 304.3 |  |  | $ | 178.7 |  |  | $ | — |  |  | $ | 483.0 |
Commercial | 99.2 |  |  | 151.6 |  |  | — |  |  | 250.8 |
Industrial | 41.0 |  |  | 125.7 |  |  | — |  |  | 166.7 |
Off-system | 14.5 |  |  | — |  |  | — |  |  | 14.5 |
Miscellaneous | 4.6 |  |  | (1.0) |  |  | 0.2 |  |  | 3.8 |
Total Customer Revenues | $ | 463.6 |  |  | $ | 455.0 |  |  | $ | 0.2 |  |  | $ | 918.8 |
Other Revenues | 8.7 |  |  | 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 Operations |  | Electric Operations |  | Corporate and Other |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 306.9 |  |  | $ | 164.8 |  |  | $ | — |  |  | $ | 471.7 |
Commercial | 91.8 |  |  | 132.3 |  |  | — |  |  | 224.1 |
Industrial | 42.8 |  |  | 102.7 |  |  | — |  |  | 145.5 |
Off-system | 6.0 |  |  | — |  |  | — |  |  | 6.0 |
Miscellaneous | 6.8 |  |  | 7.2 |  |  | 0.2 |  |  | 14.2 |
Total Customer Revenues | $ | 454.3 |  |  | $ | 407.0 |  |  | $ | 0.2 |  |  | $ | 861.5 |
Other Revenues | 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 18, "Business Segment Information," for discussion of intersegment revenues.
Nine Months Ended September 30, 2021 (in millions) | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other(2) |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 1,456.5 |  |  | $ | 439.8 |  |  | $ | — |  |  | $ | 1,896.3 |
Commercial | 496.0 |  |  | 404.4 |  |  | — |  |  | 900.4 |
Industrial | 142.9 |  |  | 367.7 |  |  | — |  |  | 510.6 |
Off-system | 46.0 |  |  | — |  |  | — |  |  | 46.0 |
Miscellaneous | 19.2 |  |  | 4.6 |  |  | 0.6 |  |  | 24.4 |
Total Customer Revenues | $ | 2,160.6 |  |  | $ | 1,216.5 |  |  | $ | 0.6 |  |  | $ | 3,377.7 |
Other Revenues | 21.8 |  |  | 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 Operations |  | Electric Operations |  | Corporate and Other |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 1,518.1 |  |  | $ | 411.5 |  |  | $ | — |  |  | $ | 1,929.6 |
Commercial | 483.9 |  |  | 365.4 |  |  | — |  |  | 849.3 |
Industrial | 165.6 |  |  | 301.1 |  |  | — |  |  | 466.7 |
Off-system | 32.7 |  |  | — |  |  | — |  |  | 32.7 |
Miscellaneous | 24.6 |  |  | 16.6 |  |  | 0.6 |  |  | 41.8 |
Total Customer Revenues | $ | 2,224.9 |  |  | $ | 1,094.6 |  |  | $ | 0.6 |  |  | $ | 3,320.1 |
Other Revenues | 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 18, "Business Segment Information," for discussion of intersegment revenues.
Customer Accounts Receivable | 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, 2021 | 272.7 |  |  | 204.5 |  |  |
Accounts Receivable, Allowance for Credit Loss | 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 Operations |  | Electric Operations |  | Corporate and Other |  | Total
Balance as of January 1, 2021 | $ | 41.8 |  |  | $ | 9.7 |  |  | $ | 0.8 |  |  | $ | 52.3 |
Current period provisions | 7.7 |  |  | (0.6) |  |  | — |  |  | 7.1 |
Write-offs charged against allowance | (34.7) |  |  | (6.2) |  |  | — |  |  | (40.9) |
Recoveries of amounts previously written off | 9.4 |  |  | 0.4 |  |  | — |  |  | 9.8 |
Balance as of September 30, 2021 | $ | 24.2 |  |  | $ | 3.3 |  |  | $ | 0.8 |  |  | $ | 28.3 |
(in millions) | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other |  | Total
Balance as of January 1, 2020 | $ | 9.1 |  |  | $ | 3.1 |  |  | $ | 0.8 |  |  | $ | 13.0 |
Current period provisions | 45.3 |  |  | 9.3 |  |  | — |  |  | 54.6 |
Write-offs charged against allowance | (26.7) |  |  | (3.0) |  |  | — |  |  | (29.7) |
Recoveries of amounts previously written off | 14.1 |  |  | 0.3 |  |  | — |  |  | 14.4 |
Balance as of December 31, 2020 | $ | 41.8 |  |  | $ | 9.7 |  |  | $ | 0.8 |  |  | $ | 52.3 |

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