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v3.22.2

Variable Interest Entities (Narrative) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2022 USD ($) Rate MW
Variable Interest Entity [Line Items] |
Wind Power Purchase Agreement, Purchase Percentage | Rate | 100.00%
Rosewater |
Variable Interest Entity [Line Items] |
Nameplate Capacity | MW | 102
Total Cash Contributions | $ | $ 170.1
Indiana Crossroads Wind |
Variable Interest Entity [Line Items] |
Nameplate Capacity | MW | 302
Total Cash Contributions | $ | $ 511.8

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- Definition Nameplate Capacity + References No definition available. + Details
Name: | nix_NameplateCapacity
Namespace Prefix: | nix_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total Cash Contributions + References No definition available. + Details
Name: | nix_TotalCashContributions
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Wind Power Purchase Agreement, Purchase Percentage + References No definition available. + Details
Name: | nix_WindPowerPurchaseAgreementPurchasePercentage
Namespace Prefix: | nix_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=nix_RosewaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=nix_IndianaCrossroadsWindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |