Common Equity (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Common Equity [Line Items]

Common Stock Activity

A summary of Alliant Energy’s common stock activity was as follows:

	2019		2018		2017
Shares outstanding, January 1	236,063,279		231,348,646		227,673,654
Equity forward agreements	8,358,973		—		—
At-the-market offering programs	—		4,171,013		3,074,931
Shareowner Direct Plan	501,808		576,965		640,723
Equity-based compensation plans	101,478		5,078		5,185
Other	(2,738	)	(38,423	)	(45,847	)
Shares outstanding, December 31	245,022,800		236,063,279		231,348,646