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Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current      
Federal $ 0.0 $ 0.4 $ (0.1)
State 5.3 7.3 6.0
Total Current 5.3 7.7 5.9
Deferred      
Federal 458.6    
State 22.5 (23.0) 13.8
Total Deferred 135.2 158.0 113.0
Deferred Investment Credits (1.0) (1.1) (1.1)
Income Taxes 139.5 164.6 117.8
Investment Tax Credit Carryforward      
Deferred      
Federal $ 2.1 0.0 0.0
Schedule Of Components Of Income Tax Expense The components of income tax expense (benefit) were as follows: 
Year Ended December 31, (in millions)
202320222021
Income Taxes
Current
Federal$— $0.4 $(0.1)
State5.3 7.3 6.0 
Total Current5.3 7.7 5.9 
Deferred
Federal
Taxes before operating loss carryforwards and investment credits
49.7 87.9 35.7 
Tax utilization expense of operating loss carryforwards
65.1 93.1 63.5 
Investment tax credits
(2.1)— — 
State22.5 (23.0)13.8 
Total Deferred135.2 158.0 113.0 
Deferred Investment Credits(1.0)(1.1)(1.1)
Income Taxes$139.5 $164.6 $117.8 
In connection with the NIPSCO Minority Interest Transaction, NiSource recognized a $63.5 million income tax benefit in additional paid in capital related to 19.9% of NIPSCO’s excess deferred income taxes attributable to Blackstone’s noncontrolling interest. This benefit does not impact NIPSCO’s regulatory books or the excess deferred taxes that will benefit customers through lower future rates in accordance with applicable regulatory orders. See Note 4, "Noncontrolling Interest," for further discussion of the NIPSCO Minority Interest Transaction.
    
Operating loss carryforward and investment credits      
Deferred      
Federal $ 49.7 87.9 35.7
Utilization expense of operating loss carryforwards      
Deferred      
Federal $ 65.1 $ 93.1 $ 63.5