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Equity (Schedule of Equity Units) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Equity Units [Line Items] |  |  |
Purchase Contract Liability | $ 0.0 | $ 0.0 | $ 65.0

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- Definition Equity Units [Line Items] + References No definition available. + Details
Name: | nix_EquityUnitsLineItems
Namespace Prefix: | nix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchase Contract Liability + References No definition available. + Details
Name: | nix_PurchaseContractLiability
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant