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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2015
Dec. 31, 2014
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 240,000,000 240,000,000
Common stock, shares outstanding (in shares) 113,263,624 110,935,680
Shares in deferred compensation trust (in shares) 206,419 238,935
Shares in deferred compensation trust, weighted average cost per share (in dollars per share) $ 38.82 $ 37.45
IPL [Member]    
Common stock, par value $ 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 $ 5.00 $ 5.00
Common stock, shares authorized (in shares) 18,000,000 18,000,000
Common stock, shares outstanding (in shares) 13,236,601 13,236,601