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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 2015
Stockholders' Equity Note [Abstract] |
Common Share Activity | A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2015 | 110,935,680 |
At-the-market offering program | 2,186,617 |
Shareowner Direct Plan | 204,213 |
Equity-based compensation plans (Note 9(b)) | 56,378 |
Other | (22,463 | )
Shares outstanding, September 30, 2015 | 113,360,425 |

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