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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1,054.1 $ 1,067.2 $ 2,697.1 $ 2,963.3
Other revenues 30.6 22.8 93.9 92.7
Total Operating Revenues 1,084.7 1,090.0 2,791.0 3,056.0
Revenues 1,084.7 1,090.0 2,791.0 3,056.0
NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 605.3 688.4 1,834.1 2,143.5
NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 448.8 378.8 863.0 819.8
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.0 0.0 0.0 0.0
Other revenues 0.1 0.2 0.3 0.4
Revenues 139.1 123.0 279.2 239.9
Corporate and Other | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 0.1 0.2 0.3 0.4
NIPSCO Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 576.8 549.8 1,309.5 1,442.9
Other revenues 20.4 18.4 40.1 42.2
Total Operating Revenues 597.2 568.2 1,349.6  
Revenues 597.4 568.3 1,350.1 1,485.5
NIPSCO Operations | Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 128.0 171.0 446.5 623.1
NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 448.8 378.8 863.0 819.8
NIPSCO Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 597.2 568.2 1,349.6 1,485.1
Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 477.3 517.4 1,387.6 1,520.4
Other revenues 10.1 4.2 53.5 50.1
Revenues 490.5 524.7 1,447.4 1,576.6
Columbia Operations | Unaffiliated        
Disaggregation of Revenue [Line Items]        
Revenues 487.4 521.6 1,441.1 1,570.5
Residential | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 410.9 450.6 1,251.0 1,437.6
Residential | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 156.9 122.8 300.7 273.2
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 78.6 105.9 290.7 408.3
Residential | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 156.9 122.8 300.7 273.2
Residential | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 332.3 344.7 960.3 1,029.3
Commercial | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 127.6 152.1 422.7 512.7
Commercial | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 154.4 130.1 297.3 281.0
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 30.7 43.1 105.4 155.7
Commercial | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 154.4 130.1 297.3 281.0
Commercial | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 96.9 109.0 317.3 357.0
Industrial | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 49.1 51.1 113.0 123.0
Industrial | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 119.7 112.6 235.6 246.8
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 16.1 18.8 39.9 50.3
Industrial | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 119.7 112.6 235.6 246.8
Industrial | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 33.0 32.3 73.1 72.7
Off-system | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 10.6 22.9 23.4 40.1
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 10.6 22.9 23.4 40.1
Miscellaneous | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 6.9 11.3 23.0 28.7
Miscellaneous | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 4.7 3.9 7.9 4.7
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 2.6 3.2 10.5 8.8
Miscellaneous | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues 4.7 3.9 7.9 4.7
Miscellaneous | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 4.3 8.1 12.5 19.9
Wholesale | NiSource Gas Distribution        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.2 0.4 1.0 1.4
Wholesale | NiSource Electric Generation and Power Delivery        
Disaggregation of Revenue [Line Items]        
Customer revenues 11.2 7.7 17.5 10.3
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 11.2 7.7 17.5 10.3
Wholesale | Columbia Operations        
Disaggregation of Revenue [Line Items]        
Customer revenues 0.2 0.4 1.0 1.4
Public Authority        
Disaggregation of Revenue [Line Items]        
Customer revenues 1.9 1.7 4.0 3.8
Public Authority | NIPSCO Operations | NIPSCO Electric Generation        
Disaggregation of Revenue [Line Items]        
Customer revenues $ 1.9 $ 1.7 $ 4.0 $ 3.8