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Common Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Stockholders' Equity Note [Abstract] |
Common Share Activity | A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2013 | 110,987,400 |
Equity-based compensation plans (Note 5(b)) | (23,374 | )
Other | (20,357 | )
Shares outstanding, September 30, 2013 | 110,943,669 |

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