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Variable Interest Entities (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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