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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Common Share Activity | A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2018 | 231,348,646 |
At-the-market offering program | 4,171,013 |
Shareowner Direct Plan issuances | 450,133 |
Equity-based compensation plans (Note 10(b)) | 5,078 |
Other | (38,423 | )
Shares outstanding, September 30, 2018 | 235,936,447 |

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