Segments Of Business

6 Months Ended

Jun. 30, 2015

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.

	Utility									Non-Regulated,			Alliant Energy
	Electric		Gas			Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$640.4		$51.7			$14.8		$706.9		$10.3			$717.2
Operating income (loss)	100.9		(2.0		)	3.2		102.1		6.9			109.0
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								55.7		13.2			68.9
Loss from discontinued operations, net of tax								—		(1.3		)	(1.3		)
Net income								55.7		11.9			67.6
Three Months Ended June 30, 2014
Operating revenues		$643.9		$76.9			$15.6		$736.4		$13.9			$750.3
Operating income	89.1		2.7			2.2		94.0		9.3			103.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								53.0		9.1			62.1
Loss from discontinued operations, net of tax								—		(0.3		)	(0.3		)
Net income								53.0		8.8			61.8

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Six Months Ended June 30, 2015
Operating revenues		$1,311.7		$250.1		$31.2		$1,593.0		$21.6			$1,614.6
Operating income	205.6		34.3		8.5		248.4		13.5			261.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							148.1		17.4			165.5
Loss from discontinued operations, net of tax							—		(1.3		)	(1.3		)
Net income							148.1		16.1			164.2
Six Months Ended June 30, 2014
Operating revenues		$1,319.7		$317.6		$38.4		$1,675.7		$27.4			$1,703.1
Operating income	183.4		45.7		10.1		239.2		18.3			257.5
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							151.2		18.9			170.1
Loss from discontinued operations, net of tax							—		(0.3		)	(0.3		)
Net income							151.2		18.6			169.8

IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.

	Electric		Gas			Other		Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$339.4		$29.8			$13.0		$382.2
Operating income (loss)	33.9		(2.4		)	2.3		33.8
Earnings available for common stock								16.7
Three Months Ended June 30, 2014
Operating revenues		$354.6		$43.7			$13.6		$411.9
Operating income	29.0		1.6			3.4		34.0
Earnings available for common stock								18.4
Six Months Ended June 30, 2015
Operating revenues		$702.0		$141.0			$28.2		$871.2
Operating income	74.2		18.2			6.9		99.3
Earnings available for common stock								64.5
Six Months Ended June 30, 2014
Operating revenues		$728.8		$179.4			$32.6		$940.8
Operating income	55.5		24.9			11.1		91.5
Earnings available for common stock								61.8

WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$301.0		$21.9		$1.8			$324.7
Operating income	67.0		0.4		0.9			68.3
Earnings available for common stock								39.0
Three Months Ended June 30, 2014
Operating revenues		$289.3		$33.2		$2.0			$324.5
Operating income (loss)	60.1		1.1		(1.2		)	60.0
Earnings available for common stock								34.6
Six Months Ended June 30, 2015
Operating revenues		$609.7		$109.1		$3.0			$721.8
Operating income	131.4		16.1		1.6			149.1
Earnings available for common stock								83.6
Six Months Ended June 30, 2014
Operating revenues		$590.9		$138.2		$5.8			$734.9
Operating income (loss)	127.9		20.8		(1.0		)	147.7
Earnings available for common stock								89.4

IPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.

	Utility									Non-Regulated,			Alliant Energy
	Electric		Gas			Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$640.4		$51.7			$14.8		$706.9		$10.3			$717.2
Operating income (loss)	100.9		(2.0		)	3.2		102.1		6.9			109.0
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								55.7		13.2			68.9
Loss from discontinued operations, net of tax								—		(1.3		)	(1.3		)
Net income								55.7		11.9			67.6
Three Months Ended June 30, 2014
Operating revenues		$643.9		$76.9			$15.6		$736.4		$13.9			$750.3
Operating income	89.1		2.7			2.2		94.0		9.3			103.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								53.0		9.1			62.1
Loss from discontinued operations, net of tax								—		(0.3		)	(0.3		)
Net income								53.0		8.8			61.8

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Six Months Ended June 30, 2015
Operating revenues		$1,311.7		$250.1		$31.2		$1,593.0		$21.6			$1,614.6
Operating income	205.6		34.3		8.5		248.4		13.5			261.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							148.1		17.4			165.5
Loss from discontinued operations, net of tax							—		(1.3		)	(1.3		)
Net income							148.1		16.1			164.2
Six Months Ended June 30, 2014
Operating revenues		$1,319.7		$317.6		$38.4		$1,675.7		$27.4			$1,703.1
Operating income	183.4		45.7		10.1		239.2		18.3			257.5
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							151.2		18.9			170.1
Loss from discontinued operations, net of tax							—		(0.3		)	(0.3		)
Net income							151.2		18.6			169.8

IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.

	Electric		Gas			Other		Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$339.4		$29.8			$13.0		$382.2
Operating income (loss)	33.9		(2.4		)	2.3		33.8
Earnings available for common stock								16.7
Three Months Ended June 30, 2014
Operating revenues		$354.6		$43.7			$13.6		$411.9
Operating income	29.0		1.6			3.4		34.0
Earnings available for common stock								18.4
Six Months Ended June 30, 2015
Operating revenues		$702.0		$141.0			$28.2		$871.2
Operating income	74.2		18.2			6.9		99.3
Earnings available for common stock								64.5
Six Months Ended June 30, 2014
Operating revenues		$728.8		$179.4			$32.6		$940.8
Operating income	55.5		24.9			11.1		91.5
Earnings available for common stock								61.8

WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$301.0		$21.9		$1.8			$324.7
Operating income	67.0		0.4		0.9			68.3
Earnings available for common stock								39.0
Three Months Ended June 30, 2014
Operating revenues		$289.3		$33.2		$2.0			$324.5
Operating income (loss)	60.1		1.1		(1.2		)	60.0
Earnings available for common stock								34.6
Six Months Ended June 30, 2015
Operating revenues		$609.7		$109.1		$3.0			$721.8
Operating income	131.4		16.1		1.6			149.1
Earnings available for common stock								83.6
Six Months Ended June 30, 2014
Operating revenues		$590.9		$138.2		$5.8			$734.9
Operating income (loss)	127.9		20.8		(1.0		)	147.7
Earnings available for common stock								89.4

WPL [Member]

Segment Reporting Information [Line Items]

Segments Of Business

SEGMENTS OF BUSINESS

Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.

	Utility									Non-Regulated,			Alliant Energy
	Electric		Gas			Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$640.4		$51.7			$14.8		$706.9		$10.3			$717.2
Operating income (loss)	100.9		(2.0		)	3.2		102.1		6.9			109.0
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								55.7		13.2			68.9
Loss from discontinued operations, net of tax								—		(1.3		)	(1.3		)
Net income								55.7		11.9			67.6
Three Months Ended June 30, 2014
Operating revenues		$643.9		$76.9			$15.6		$736.4		$13.9			$750.3
Operating income	89.1		2.7			2.2		94.0		9.3			103.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								53.0		9.1			62.1
Loss from discontinued operations, net of tax								—		(0.3		)	(0.3		)
Net income								53.0		8.8			61.8

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Six Months Ended June 30, 2015
Operating revenues		$1,311.7		$250.1		$31.2		$1,593.0		$21.6			$1,614.6
Operating income	205.6		34.3		8.5		248.4		13.5			261.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							148.1		17.4			165.5
Loss from discontinued operations, net of tax							—		(1.3		)	(1.3		)
Net income							148.1		16.1			164.2
Six Months Ended June 30, 2014
Operating revenues		$1,319.7		$317.6		$38.4		$1,675.7		$27.4			$1,703.1
Operating income	183.4		45.7		10.1		239.2		18.3			257.5
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							151.2		18.9			170.1
Loss from discontinued operations, net of tax							—		(0.3		)	(0.3		)
Net income							151.2		18.6			169.8

IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.

	Electric		Gas			Other		Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$339.4		$29.8			$13.0		$382.2
Operating income (loss)	33.9		(2.4		)	2.3		33.8
Earnings available for common stock								16.7
Three Months Ended June 30, 2014
Operating revenues		$354.6		$43.7			$13.6		$411.9
Operating income	29.0		1.6			3.4		34.0
Earnings available for common stock								18.4
Six Months Ended June 30, 2015
Operating revenues		$702.0		$141.0			$28.2		$871.2
Operating income	74.2		18.2			6.9		99.3
Earnings available for common stock								64.5
Six Months Ended June 30, 2014
Operating revenues		$728.8		$179.4			$32.6		$940.8
Operating income	55.5		24.9			11.1		91.5
Earnings available for common stock								61.8

WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2015
Operating revenues		$301.0		$21.9		$1.8			$324.7
Operating income	67.0		0.4		0.9			68.3
Earnings available for common stock								39.0
Three Months Ended June 30, 2014
Operating revenues		$289.3		$33.2		$2.0			$324.5
Operating income (loss)	60.1		1.1		(1.2		)	60.0
Earnings available for common stock								34.6
Six Months Ended June 30, 2015
Operating revenues		$609.7		$109.1		$3.0			$721.8
Operating income	131.4		16.1		1.6			149.1
Earnings available for common stock								83.6
Six Months Ended June 30, 2014
Operating revenues		$590.9		$138.2		$5.8			$734.9
Operating income (loss)	127.9		20.8		(1.0		)	147.7
Earnings available for common stock								89.4