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

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- 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

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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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