Common Equity (Tables)

9 Months Ended

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