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Common Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Schedule of Common Equity [Line Items]  
Common Stock Activity A summary of Alliant Energy’s common stock activity was as follows:
202320222021
Shares outstanding, January 1251,134,966 250,474,529 249,868,415 
At-the-market offering program4,372,561 — — 
Shareowner Direct Plan454,987 437,669 492,565 
Equity-based compensation plans134,334 222,768 113,549 
Shares outstanding, December 31256,096,848 251,134,966 250,474,529