v3.25.2
Cover Page Document
Aug. 06, 2025
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Aug. 06, 2025
Entity Registrant Name NiSource Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-16189
Entity Tax Identification Number 35-2108964
Entity Address, Address Line One 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
Entity Emerging Growth Company false
Entity Central Index Key 0001111711
Amendment Flag false
Common Stock  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol NI
Security Exchange Name NYSE