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Common Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity Note [Abstract] |
Common Share Activity | A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2017 | 227,673,654 |
Shareowner Direct Plan issuances | 190,286 |
Equity-based compensation plans (Note 9(b)) | 5,185 |
Other | (45,847 | )
Shares outstanding, March 31, 2017 | 227,823,278 |

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