v3.26.1
Exempt Party-In-Interest Transactions (Details) - EBP 005 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Total investments $ 2,314,717,802 $ 1,995,108,955
NiSource Stock Fund    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Number of shares (in shares) 13,550,555 14,291,070
Cost $ 131,013,975 $ 127,200,305
Total investments $ 240,386,845 $ 223,369,418
NiSource Inc. common stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Number of shares (in shares) 5,700,723 6,021,308
Cost $ 128,620,274 $ 125,096,602
Dividend income $ 6,567,973