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Subsequent Event (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 28, 2025
Sep. 30, 2025
Sep. 30, 2024
Subsequent Event [Line Items]      
Payment to renewable generation asset developer   $ 1,091.7 $ 478.8
Investment Company, Committed Capital $ 1,325.0    
Business Combination, Price of Acquisition, Expected $ 35.2    
NIPSCO Holdings II      
Subsequent Event [Line Items]      
Subsidiary, Ownership Percentage, Parent 19.90%    
Subsidiary, Ownership Percentage, Noncontrolling Owner 14.90%    
Investment Company, Committed Capital $ 175.0    
Generation Holdings II      
Subsequent Event [Line Items]      
Subsidiary, Ownership Percentage, Parent 17.50%