XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.21.1

Revenue Recognition (Tables) | 3 Months Ended
--- | ---
Mar. 31, 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 (unaudited) for the three months ended March 31, 2021 and March 31, 2020:
Three Months Ended March 31, 2021 (in millions) | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other(2) |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 773.5 |  |  | $ | 129.2 |  |  | $ | — |  |  | $ | 902.7 |
Commercial | 271.4 |  |  | 122.9 |  |  | — |  |  | 394.3 |
Industrial | 57.9 |  |  | 122.9 |  |  | — |  |  | 180.8 |
Off-system | 14.4 |  |  | — |  |  | — |  |  | 14.4 |
Miscellaneous | 9.9 |  |  | 4.2 |  |  | 0.2 |  |  | 14.3 |
Total Customer Revenues | $ | 1,127.1 |  |  | $ | 379.2 |  |  | $ | 0.2 |  |  | $ | 1,506.5 |
Other Revenues | 8.7 |  |  | 23.3 |  |  | 7.1 |  |  | 39.1 |
Total Operating Revenues | $ | 1,135.8 |  |  | $ | 402.5 |  |  | $ | 7.3 |  |  | $ | 1,545.6 |
(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "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 March 31, 2020 (in millions) | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other |  | Total
Customer Revenues(1) |  |  |  |  |  |  |
Residential | $ | 796.5 |  |  | $ | 119.2 |  |  | $ | — |  |  | $ | 915.7 |
Commercial | 269.4 |  |  | 120.2 |  |  | — |  |  | 389.6 |
Industrial | 74.2 |  |  | 109.1 |  |  | — |  |  | 183.3 |
Off-system | 18.7 |  |  | — |  |  | — |  |  | 18.7 |
Miscellaneous | 12.5 |  |  | 5.9 |  |  | 0.2 |  |  | 18.6 |
Total Customer Revenues | $ | 1,171.3 |  |  | $ | 354.4 |  |  | $ | 0.2 |  |  | $ | 1,525.9 |
Other Revenues | 56.7 |  |  | 22.9 |  |  | — |  |  | 79.6 |
Total Operating Revenues | $ | 1,228.0 |  |  | $ | 377.3 |  |  | $ | 0.2 |  |  | $ | 1,605.5 |
(1) Customer revenue amounts exclude intersegment revenues. See Note 20, "Business Segment Information," for discussion of intersegment revenues.
Customer Accounts Receivable | The opening and closing balances of customer receivables for the three months ended March 31, 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 March 31, 2021 | 507.4 |  |  | 244.3 |  |  |
Increase (Decrease) | $ | 107.4 |  |  | $ | (82.9) |  |  |
Financing Receivable, Allowance for Credit Loss | A rollforward of our allowance for credit losses for the three months ended March 31, 2021 are presented in the table below:
Three Months Ended March 31, 2021 (in millions) | Gas Distribution Operations |  | Electric Operations |  | Corporate and Other |  | Total
Beginning balance | $ | 41.8 |  |  | $ | 9.7 |  |  | $ | 0.8 |  |  | $ | 52.3 |
Current period provisions | 5.9 |  |  | 2.9 |  |  | — |  |  | 8.8 |
Write-offs charged against allowance | (9.0) |  |  | (2.4) |  |  | — |  |  | (11.4) |
Recoveries of amounts previously written off | 4.1 |  |  | 0.1 |  |  | — |  |  | 4.2 |
Ending balance of the allowance for credit losses | $ | 42.8 |  |  | $ | 10.3 |  |  | $ | 0.8 |  |  | $ | 53.9 |

X
- Definition Tabular disclosure of customer accounts receivable [Table Text Block] + References No definition available. + Details
Name: | nix_CustomerAccountsReceivableTableTextBlock
Namespace Prefix: | nix_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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