v3.25.2
Goodwill (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Goodwill $ 1,485.9 $ 1,485.9
NIPSCO Operations    
Goodwill [Line Items]    
Goodwill 17.8  
Columbia Operations    
Goodwill [Line Items]    
Goodwill 1,468.1  
Corporate and Other    
Goodwill [Line Items]    
Goodwill $ 0.0