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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

X

- 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

X

- 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