XML 59 R43.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets | Regulatory assets were comprised of the following items:
At December 31, (in millions) | 2021 |  | 2020
Regulatory Assets |  |  |
Unrecognized pension and other postretirement benefit costs (see Note 12) | $ | 512.1 |  |  | $ | 583.3 |
Deferred pension and other postretirement benefit costs (see Note 12) | 74.8 |  |  | 72.4 |
Environmental costs (see Note 19-E) | 45.8 |  |  | 56.6 |
Regulatory effects of accounting for income taxes (see Note 1-N and Note 11) | 194.8 |  |  | 194.5 |
Under-recovered gas and fuel costs (see Note 1-J) | 73.6 |  |  | 8.0 |
Depreciation | 177.5 |  |  | 192.6 |
Post-in-service carrying charges | 237.9 |  |  | 228.6 |
Safety activity costs | 171.9 |  |  | 146.0 |
DSM programs | 39.2 |  |  | 37.8 |
Retired coal generating stations | 803.9 |  |  | 204.7 |
Losses on commodity price risk programs (See Note 10) | 9.6 |  |  | 54.7 |
Deferred property taxes | 65.1 |  |  | 62.9 |
Renewable energy investments (See Note 1-S and Note 4) | 18.5 |  |  | — |
Other | 67.5 |  |  | 88.4 |
Total Regulatory Assets | $ | 2,492.2 |  |  | $ | 1,930.5 |
Less: Current Portion | 206.2 |  |  | 135.7 |
Total Noncurrent Regulatory Assets | $ | 2,286.0 |  |  | $ | 1,794.8 |
Regulatory Liabilities | Regulatory liabilities were comprised of the following items:
At December 31, (in millions) | 2021 |  | 2020
Regulatory Liabilities |  |  |
Over-recovered gas and fuel costs (see Note 1-J) | $ | 5.4 |  |  | $ | 47.8 |
Cost of removal (see Note 8) | 749.5 |  |  | 775.2 |
Regulatory effects of accounting for income taxes (see Note 1-N and Note 11) | 1,040.8 |  |  | 1,105.1 |
Deferred pension and other postretirement benefit costs (see Note 12) | 75.9 |  |  | 69.5 |
Gains on commodity price risk programs (See Note 10) | 34.2 |  |  | 14.0 |
Other | 74.2 |  |  | 53.9 |
Total Regulatory Liabilities | $ | 1,980.0 |  |  | $ | 2,065.5 |
Less: Current Portion | 137.4 |  |  | 161.3 |
Total Noncurrent Regulatory Liabilities | $ | 1,842.6 |  |  | $ | 1,904.2 |
Schedule of COVID-19 Regulatory Impact | The ongoing impacts of these approvals or directives are described in the table below:
Jurisdiction | Moratorium in Place? | Regulatory Asset balance as of December 31, 2021 (in millions) | Regulatory Asset balance as of December 31, 2020 (in millions) | Deferred COVID-19 Costs
Columbia of Ohio | No | $ | 2.1 |  | $ | 2.0 |  | Incremental operation and maintenance expenses
NIPSCO | No | $ | 2.2 |  | $ | 9.2 |  | Incremental bad debt expense and the costs to implement the requirements of the COVID-19 related order
Columbia of Pennsylvania | No | $ | 5.2 |  | $ | 5.4 |  | Incremental bad debt expense incurred from March 13, 2020 through December 29, 2021, above levels currently in rates
Columbia of Virginia | No | $ | 1.5 |  | $ | — |  | Incremental incurred costs (including incremental bad debt expense), subject to an earnings test review
Columbia of Maryland | No | $ | 0.9 |  | $ | 0.7 |  | Incremental costs (including incremental bad debt expense) incurred to ensure that customers have essential utility service during the state of emergency in Maryland. Such incremental costs must be offset by any benefit received in connection with the pandemic

X
- Definition Schedule of COVID-19 Regulatory Impact + References No definition available. + Details
Name: | nix_ScheduleOfCOVID19RegulatoryImpactTableTextBlock
Namespace Prefix: | nix_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
Name: | us-gaap_ScheduleOfRegulatoryAssetsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_ScheduleOfRegulatoryLiabilitiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration