v3.25.2
Variable Interest Entities (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 18, 2025
USD ($)
May 31, 2025
USD ($)
Feb. 03, 2025
USD ($)
Jan. 15, 2025
USD ($)
Jun. 30, 2025
USD ($)
Rate
MW
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Rate
MW
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Variable Interest Entity [Line Items]                  
Wind Power Purchase Agreement, Purchase Percentage | Rate         100.00%   100.00%    
Payments to Acquire Assets, Investing Activities | $ $ 262.4 $ 141.4 $ 217.6 $ 336.6          
Income Taxes | $         $ 23.8 $ 17.6 $ 129.5 $ 93.6  
Contributions from NIPSCO minority interest holders | $         99.5 59.7 134.3 59.7  
Payments to Noncontrolling Interests | $         $ 26.9 $ 20.2 $ 44.4 $ 20.2 $ 20.2
Rosewater                  
Variable Interest Entity [Line Items]                  
Nameplate Capacity | MW         102   102    
Indiana Crossroads Wind                  
Variable Interest Entity [Line Items]                  
Nameplate Capacity | MW         302   302    
Indiana Crossroads Solar                  
Variable Interest Entity [Line Items]                  
Nameplate Capacity | MW         200   200    
Dunns Bridge I                  
Variable Interest Entity [Line Items]                  
Nameplate Capacity | MW         265   265