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Regulatory Matters (Narrative) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Regulated Operations [Abstract]
Columbia of Maryland COVID Relief Funds	$ 0.8

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- Definition

Columbia of Maryland COVID Relief Funds

+ References

No definition available.

+ Details

Name:	nix_ColumbiaOfMarylandCOVIDReliefFunds
Namespace Prefix:	nix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_RegulatedOperationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration