v3.25.2
Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2025
Dec. 31, 2024
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 480,000,000 480,000,000
Common stock, shares outstanding (in shares) 256,969,227 256,690,222
Shares in deferred compensation trust (in shares) 356,799 372,116
Shares in deferred compensation trust, weighted average cost per share (in dollars per share) $ 37.77 $ 36.56
IPL [Member]    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, shares authorized (in shares) 24,000,000 24,000,000
Common stock, shares outstanding (in shares) 13,370,788 13,370,788
WPL [Member]    
Common stock, par value (in dollars per share) $ 5 $ 5
Common stock, shares authorized (in shares) 18,000,000 18,000,000
Common stock, shares outstanding (in shares) 13,236,601 13,236,601