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Long-Term Debt (Narrative) (Details) - NiSource - USD ($)
$ in Millions
Jun. 07, 2022
Sep. 30, 2022
Aug. 30, 2022
Apr. 01, 2022
Medium-term Notes        
Debt Instrument [Line Items]        
Medium-term Notes, Current     $ 10.0 $ 20.0
Debt, Weighted Average Interest Rate     7.40% 7.99%
Medium-term Notes, Noncurrent   $ 29.0    
Senior Notes        
Debt Instrument [Line Items]        
Debt, Weighted Average Interest Rate 5.00%      
Senior Notes $ 350.0      
Proceeds from Debt, Net of Issuance Costs $ 344.6