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Earnings Per Share (Narrative) (Details)	Apr. 19, 2021 $ / shares
Equity Units
Earnings Per Share [Line Items]
Shares Issued, Price Per Share	$ 24.51

X

- Definition

Earnings Per Share

+ References

No definition available.

+ Details

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Namespace Prefix:	nix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=nix_EquityUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: