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Regulatory Matters (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Apr. 06, 2022
Public Utilities, General Disclosures [Line Items]          
Regulatory Deferral - Joint Venture $ 9.6 $ 0.0 $ 6.7 $ 0.0  
Minimum          
Public Utilities, General Disclosures [Line Items]          
Recommended Rate increase, percentage         4.00%
Recommended Rate Increase, Amount         $ 35.2
Maximum          
Public Utilities, General Disclosures [Line Items]          
Recommended Rate increase, percentage         6.30%
Recommended Rate Increase, Amount         $ 57.6
Columbia Of Ohio          
Public Utilities, General Disclosures [Line Items]          
Public Utilities, Requested Rate Increase (Decrease), Percentage     21.30%    
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 221.4    
NIPSCO - Electric | Overrecovered Gas and Fuel Costs          
Public Utilities, General Disclosures [Line Items]          
Regulatory Liabilities $ 8.0   $ 8.0