XML 56 R46.htm IDEA: XBRL DOCUMENT
v3.22.2.2

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
Name: | nix_EarningsPerShareLineItems
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
Name: | us-gaap_SharesIssuedPricePerShare
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: |