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Document and Entity Information
Sep. 09, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Sep. 09, 2024
Entity Registrant Name NiSource Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-16189
Entity Tax Identification Number 35-2108964
Entity Address Address Line 1 801 East 86th Avenue
Entity Address City Or Town Merrillville
Entity Address State Or Province IN
Entity Address Postal Zip Code 46410
City Area Code 877
Local Phone Number 647-5990
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol NI
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0001111711
Amendment Flag false