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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1,046.1 $ 1,002.6 $ 3,743.2 $ 3,965.9
Other revenues 30.2 24.8 124.1 117.5
Total Operating Revenues 1,076.3 1,027.4 3,867.3 4,083.4
Revenues 1,076.3 1,027.4 3,867.3 4,083.4
NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 531.0 524.9 2,365.2 2,668.4
NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 515.1 477.7 1,378.0 1,297.5
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Other revenues 0.3 0.2 0.6 0.6
Revenues 145.9 121.9 425.1 361.8
Corporate and Other | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 0.3 0.2 0.6 0.6
NIPSCO Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 628.8 595.0 1,938.3 2,037.9
Other revenues 23.8 21.2 63.9 63.4
Total Operating Revenues 652.6 616.2 2,002.2  
Revenues 652.9 616.6 2,003.0 2,102.1
NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 113.7 117.3 560.3 740.4
NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 515.1 477.7 1,378.0 1,297.5
NIPSCO Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 652.6 616.2 2,002.2 2,101.3
Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 417.3 407.6 1,804.9 1,928.0
Other revenues 6.1 3.4 59.6 53.5
Revenues 426.7 414.0 1,874.1 1,990.6
Columbia Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 423.4 411.0 1,864.5 1,981.5
Residential | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 363.7 351.7 1,614.7 1,789.3
Residential | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 197.9 176.0 498.6 449.2
Residential | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Residential | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 66.8 69.1 357.5 477.4
Residential | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 197.9 176.0 498.6 449.2
Residential | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 296.9 282.6 1,257.2 1,311.9
Commercial | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 106.9 108.5 529.6 621.2
Commercial | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 172.7 156.6 470.0 437.6
Commercial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Commercial | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 28.6 30.0 134.0 185.7
Commercial | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 172.7 156.6 470.0 437.6
Commercial | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 78.3 78.5 395.6 435.5
Industrial | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 48.4 46.3 161.4 169.3
Industrial | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 124.8 115.9 360.4 362.7
Industrial | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Industrial | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 16.4 16.1 56.3 66.4
Industrial | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 124.8 115.9 360.4 362.7
Industrial | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 32.0 30.2 105.1 102.9
Off-system | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 7.1 9.8 30.5 49.9
Off-system | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Off-system | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Off-system | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 7.1 9.8 30.5 49.9
Miscellaneous | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 4.8 8.5 27.9 37.2
Miscellaneous | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 2.7 12.4 10.6 17.0
Miscellaneous | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Miscellaneous | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 1.9 2.1 12.5 10.9
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 2.7 12.4 10.6 17.0
Miscellaneous | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 2.9 6.4 15.4 26.3
Wholesale | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.1 0.1 1.1 1.5
Wholesale | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 15.0 15.2 32.4 25.5
Wholesale | Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Wholesale | NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Wholesale | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 15.0 15.2 32.4 25.5
Wholesale | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.1 0.1 1.1 1.5
Public Authority        
Disaggregation of Revenue [Line Items]        
Customer revenues 2.0 1.6 6.0 5.5
Public Authority | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues $ 2.0 $ 1.6 $ 6.0 $ 5.5