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Long-Term Debt (Narrative) (Details) - NiSource - USD ($)
$ in Millions
Jun. 07, 2022
Jun. 30, 2022
Apr. 01, 2022
Medium-term Notes      
Debt Instrument [Line Items]      
Medium-term Notes, Current     $ 20.0
Debt, Weighted Average Interest Rate     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