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Gas in Storage (Narrative) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Gas in Storage [Abstract]
LIFO Inventory Amount	$ 0.0

X

- Definition

Gas in Storage [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483489/210-10-50-1

+ Details

Name:	us-gaap_LIFOInventoryAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant