Common Equity (Tables)

12 Months Ended

Dec. 31, 2014

Schedule of Common Equity [Line Items]

Common Stock Activity

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

	2014		2013		2012
Shares outstanding, January 1	110,943,669		110,987,400		111,018,821
Equity-based compensation plans (Note 12(b))	35,547		(23,374	)	20,195
Other	(43,536	)	(20,357	)	(51,616	)
Shares outstanding, December 31	110,935,680		110,943,669		110,987,400

Schedule of Restricted Net Assets of Subsidiaries

As of December 31, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was as follows (in billions):

	2014		2013
IPL		$1.3		$1.2
WPL	1.6		1.5

Capital Transactions with Subsidiaries

IPL, WPL and Resources paid common stock dividends and repayments of capital to their parent company, Alliant Energy, as follows (in millions):

	IPL						WPL						Resources
	2014		2013		2012		2014		2013		2012		2014		2013		2012
Common stock dividends		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$—		$—		$—
Repayments of capital	—		—		—		—		—		—		50.0		95.0		—
Total distributions from common equity		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$50.0		$95.0		$—

Schedule of Capital Contributions

IPL, WPL and Corporate Services received capital contributions from their parent company, Alliant Energy, as follows (in millions):

	2014		2013		2012
IPL		$90.0		$120.0		$110.0
WPL	—		—		90.0
Corporate Services	—		—		30.0

IPL [Member]

Schedule of Common Equity [Line Items]

Schedule of Restricted Net Assets of Subsidiaries

As of December 31, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was as follows (in billions):

	2014		2013
IPL		$1.3		$1.2
WPL	1.6		1.5

Capital Transactions with Subsidiaries

IPL, WPL and Resources paid common stock dividends and repayments of capital to their parent company, Alliant Energy, as follows (in millions):

	IPL						WPL						Resources
	2014		2013		2012		2014		2013		2012		2014		2013		2012
Common stock dividends		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$—		$—		$—
Repayments of capital	—		—		—		—		—		—		50.0		95.0		—
Total distributions from common equity		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$50.0		$95.0		$—

Schedule of Capital Contributions

IPL, WPL and Corporate Services received capital contributions from their parent company, Alliant Energy, as follows (in millions):

	2014		2013		2012
IPL		$90.0		$120.0		$110.0
WPL	—		—		90.0
Corporate Services	—		—		30.0

WPL [Member]

Schedule of Common Equity [Line Items]

Schedule of Restricted Net Assets of Subsidiaries

As of December 31, the amount of net assets of IPL and WPL that were not available to be transferred to their parent company, Alliant Energy, in the form of loans, advances or cash dividends without the consent of IPL’s and WPL’s regulatory authorities was as follows (in billions):

	2014		2013
IPL		$1.3		$1.2
WPL	1.6		1.5

Capital Transactions with Subsidiaries

IPL, WPL and Resources paid common stock dividends and repayments of capital to their parent company, Alliant Energy, as follows (in millions):

	IPL						WPL						Resources
	2014		2013		2012		2014		2013		2012		2014		2013		2012
Common stock dividends		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$—		$—		$—
Repayments of capital	—		—		—		—		—		—		50.0		95.0		—
Total distributions from common equity		$140.0		$128.1		$122.9		$118.7		$116.3		$112.0		$50.0		$95.0		$—

Schedule of Capital Contributions

IPL, WPL and Corporate Services received capital contributions from their parent company, Alliant Energy, as follows (in millions):

	2014		2013		2012
IPL		$90.0		$120.0		$110.0
WPL	—		—		90.0
Corporate Services	—		—		30.0