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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Customer revenues $ 1,643.0 $ 1,896.1
Other revenues 63.3 69.9
Total Operating Revenues 1,706.3 1,966.0
Revenues 1,706.3 1,966.0
NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 1,228.8 1,455.1
NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 414.2 441.0
Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Other revenues 0.2 0.2
Revenues 140.1 116.9
Corporate and Other | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 0.2 0.2
NIPSCO Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 732.7 893.1
Other revenues 19.7 23.8
Total Operating Revenues 752.4  
Revenues 752.7 917.2
NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 318.5 452.1
NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 414.2 441.0
NIPSCO Operations | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 752.4 916.9
Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 910.3 1,003.0
Other revenues 43.4 45.9
Revenues 956.9 1,051.9
Columbia Operations | Unaffiliated    
Disaggregation of Revenue [Line Items]    
Revenues 953.7 1,048.9
Residential | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 840.1 987.0
Residential | NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 143.8 150.4
Residential | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Residential | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 212.1 302.4
Residential | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 143.8 150.4
Residential | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 628.0 684.6
Commercial | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 295.1 360.6
Commercial | NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 142.9 150.9
Commercial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Commercial | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 74.7 112.6
Commercial | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 142.9 150.9
Commercial | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 220.4 248.0
Industrial | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 63.9 71.9
Industrial | NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 115.9 134.2
Industrial | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Industrial | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 23.8 31.5
Industrial | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 115.9 134.2
Industrial | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 40.1 40.4
Off-system | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 12.8 17.2
Off-system | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Off-system | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 12.8 17.2
Miscellaneous | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 16.1 17.4
Miscellaneous | NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 3.2 0.8
Miscellaneous | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Miscellaneous | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 7.9 5.6
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 3.2 0.8
Miscellaneous | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 8.2 11.8
Wholesale | NiSource Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.8 1.0
Wholesale | NiSource Electric Generation and Power Delivery    
Disaggregation of Revenue [Line Items]    
Customer revenues 6.3 2.6
Wholesale | Corporate and Other    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Wholesale | NIPSCO Operations | Gas Distribution    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.0 0.0
Wholesale | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues 6.3 2.6
Wholesale | Columbia Operations    
Disaggregation of Revenue [Line Items]    
Customer revenues 0.8 1.0
Public Authority    
Disaggregation of Revenue [Line Items]    
Customer revenues 2.1 2.1
Public Authority | NIPSCO Operations | NIPSCO Electric Generation    
Disaggregation of Revenue [Line Items]    
Customer revenues $ 2.1 $ 2.1