Segments Of Business

9 Months Ended

Sep. 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 September 30, 2015
Operating revenues		$835.8		$38.0			$13.4		$887.2		$11.7			$898.9
Operating income (loss)	232.8		(5.7		)	0.2		227.3		8.6			235.9
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								184.9		(4.9		)	180.0
Loss from discontinued operations, net of tax								—		(0.1		)	(0.1		)
Net income (loss)								184.9		(5.0		)	179.9
Three Months Ended September 30, 2014
Operating revenues		$771.2		$47.2			$12.2		$830.6		$12.5			$843.1
Operating income (loss)	190.8		(4.4		)	1.4		187.8		7.0			194.8
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								164.1		(8.9		)	155.2
Loss from discontinued operations, net of tax								—		(1.9		)	(1.9		)
Net income (loss)								164.1		(10.8		)	153.3

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Nine Months Ended September 30, 2015
Operating revenues		$2,147.5		$288.1		$44.6		$2,480.2		$33.3			$2,513.5
Operating income	438.4		28.6		8.7		475.7		22.1			497.8
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							333.0		12.5			345.5
Loss from discontinued operations, net of tax							—		(1.4		)	(1.4		)
Net income							333.0		11.1			344.1
Nine Months Ended September 30, 2014
Operating revenues		$2,090.9		$364.8		$50.6		$2,506.3		$39.9			$2,546.2
Operating income	374.2		41.3		11.5		427.0		25.3			452.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							315.3		10.0			325.3
Loss from discontinued operations, net of tax							—		(2.2		)	(2.2		)
Net income							315.3		7.8			323.1

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 September 30, 2015
Operating revenues		$468.6		$23.1			$12.9		$504.6
Operating income (loss)	119.4		(2.9		)	0.5		117.0
Earnings available for common stock								117.4
Three Months Ended September 30, 2014
Operating revenues		$435.9		$28.7			$11.6		$476.2
Operating income (loss)	94.7		(2.8		)	2.0		93.9
Earnings available for common stock								102.5
Nine Months Ended September 30, 2015
Operating revenues		$1,170.6		$164.1			$41.1		$1,375.8
Operating income	193.6		15.3			7.4		216.3
Earnings available for common stock								181.9
Nine Months Ended September 30, 2014
Operating revenues		$1,164.7		$208.1			$44.2		$1,417.0
Operating income	150.2		22.1			13.1		185.4
Earnings available for common stock								164.3

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 September 30, 2015
Operating revenues		$367.2		$14.9			$0.5			$382.6
Operating income (loss)	113.4		(2.8		)	(0.3		)	110.3
Earnings available for common stock									67.5
Three Months Ended September 30, 2014
Operating revenues		$335.3		$18.5			$0.6			$354.4
Operating income (loss)	96.1		(1.6		)	(0.6		)	93.9
Earnings available for common stock									61.6
Nine Months Ended September 30, 2015
Operating revenues		$976.9		$124.0			$3.5			$1,104.4
Operating income	244.8		13.3			1.3			259.4
Earnings available for common stock									151.1
Nine Months Ended September 30, 2014
Operating revenues		$926.2		$156.7			$6.4			$1,089.3
Operating income (loss)	224.0		19.2			(1.6		)	241.6
Earnings available for common stock									151.0

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 September 30, 2015
Operating revenues		$835.8		$38.0			$13.4		$887.2		$11.7			$898.9
Operating income (loss)	232.8		(5.7		)	0.2		227.3		8.6			235.9
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								184.9		(4.9		)	180.0
Loss from discontinued operations, net of tax								—		(0.1		)	(0.1		)
Net income (loss)								184.9		(5.0		)	179.9
Three Months Ended September 30, 2014
Operating revenues		$771.2		$47.2			$12.2		$830.6		$12.5			$843.1
Operating income (loss)	190.8		(4.4		)	1.4		187.8		7.0			194.8
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								164.1		(8.9		)	155.2
Loss from discontinued operations, net of tax								—		(1.9		)	(1.9		)
Net income (loss)								164.1		(10.8		)	153.3

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Nine Months Ended September 30, 2015
Operating revenues		$2,147.5		$288.1		$44.6		$2,480.2		$33.3			$2,513.5
Operating income	438.4		28.6		8.7		475.7		22.1			497.8
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							333.0		12.5			345.5
Loss from discontinued operations, net of tax							—		(1.4		)	(1.4		)
Net income							333.0		11.1			344.1
Nine Months Ended September 30, 2014
Operating revenues		$2,090.9		$364.8		$50.6		$2,506.3		$39.9			$2,546.2
Operating income	374.2		41.3		11.5		427.0		25.3			452.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							315.3		10.0			325.3
Loss from discontinued operations, net of tax							—		(2.2		)	(2.2		)
Net income							315.3		7.8			323.1

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 September 30, 2015
Operating revenues		$468.6		$23.1			$12.9		$504.6
Operating income (loss)	119.4		(2.9		)	0.5		117.0
Earnings available for common stock								117.4
Three Months Ended September 30, 2014
Operating revenues		$435.9		$28.7			$11.6		$476.2
Operating income (loss)	94.7		(2.8		)	2.0		93.9
Earnings available for common stock								102.5
Nine Months Ended September 30, 2015
Operating revenues		$1,170.6		$164.1			$41.1		$1,375.8
Operating income	193.6		15.3			7.4		216.3
Earnings available for common stock								181.9
Nine Months Ended September 30, 2014
Operating revenues		$1,164.7		$208.1			$44.2		$1,417.0
Operating income	150.2		22.1			13.1		185.4
Earnings available for common stock								164.3

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 September 30, 2015
Operating revenues		$367.2		$14.9			$0.5			$382.6
Operating income (loss)	113.4		(2.8		)	(0.3		)	110.3
Earnings available for common stock									67.5
Three Months Ended September 30, 2014
Operating revenues		$335.3		$18.5			$0.6			$354.4
Operating income (loss)	96.1		(1.6		)	(0.6		)	93.9
Earnings available for common stock									61.6
Nine Months Ended September 30, 2015
Operating revenues		$976.9		$124.0			$3.5			$1,104.4
Operating income	244.8		13.3			1.3			259.4
Earnings available for common stock									151.1
Nine Months Ended September 30, 2014
Operating revenues		$926.2		$156.7			$6.4			$1,089.3
Operating income (loss)	224.0		19.2			(1.6		)	241.6
Earnings available for common stock									151.0

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 September 30, 2015
Operating revenues		$835.8		$38.0			$13.4		$887.2		$11.7			$898.9
Operating income (loss)	232.8		(5.7		)	0.2		227.3		8.6			235.9
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								184.9		(4.9		)	180.0
Loss from discontinued operations, net of tax								—		(0.1		)	(0.1		)
Net income (loss)								184.9		(5.0		)	179.9
Three Months Ended September 30, 2014
Operating revenues		$771.2		$47.2			$12.2		$830.6		$12.5			$843.1
Operating income (loss)	190.8		(4.4		)	1.4		187.8		7.0			194.8
Amounts attributable to Alliant Energy common shareowners:
Income (loss) from continuing operations, net of tax								164.1		(8.9		)	155.2
Loss from discontinued operations, net of tax								—		(1.9		)	(1.9		)
Net income (loss)								164.1		(10.8		)	153.3

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Nine Months Ended September 30, 2015
Operating revenues		$2,147.5		$288.1		$44.6		$2,480.2		$33.3			$2,513.5
Operating income	438.4		28.6		8.7		475.7		22.1			497.8
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							333.0		12.5			345.5
Loss from discontinued operations, net of tax							—		(1.4		)	(1.4		)
Net income							333.0		11.1			344.1
Nine Months Ended September 30, 2014
Operating revenues		$2,090.9		$364.8		$50.6		$2,506.3		$39.9			$2,546.2
Operating income	374.2		41.3		11.5		427.0		25.3			452.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							315.3		10.0			325.3
Loss from discontinued operations, net of tax							—		(2.2		)	(2.2		)
Net income							315.3		7.8			323.1

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 September 30, 2015
Operating revenues		$468.6		$23.1			$12.9		$504.6
Operating income (loss)	119.4		(2.9		)	0.5		117.0
Earnings available for common stock								117.4
Three Months Ended September 30, 2014
Operating revenues		$435.9		$28.7			$11.6		$476.2
Operating income (loss)	94.7		(2.8		)	2.0		93.9
Earnings available for common stock								102.5
Nine Months Ended September 30, 2015
Operating revenues		$1,170.6		$164.1			$41.1		$1,375.8
Operating income	193.6		15.3			7.4		216.3
Earnings available for common stock								181.9
Nine Months Ended September 30, 2014
Operating revenues		$1,164.7		$208.1			$44.2		$1,417.0
Operating income	150.2		22.1			13.1		185.4
Earnings available for common stock								164.3

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 September 30, 2015
Operating revenues		$367.2		$14.9			$0.5			$382.6
Operating income (loss)	113.4		(2.8		)	(0.3		)	110.3
Earnings available for common stock									67.5
Three Months Ended September 30, 2014
Operating revenues		$335.3		$18.5			$0.6			$354.4
Operating income (loss)	96.1		(1.6		)	(0.6		)	93.9
Earnings available for common stock									61.6
Nine Months Ended September 30, 2015
Operating revenues		$976.9		$124.0			$3.5			$1,104.4
Operating income	244.8		13.3			1.3			259.4
Earnings available for common stock									151.1
Nine Months Ended September 30, 2014
Operating revenues		$926.2		$156.7			$6.4			$1,089.3
Operating income (loss)	224.0		19.2			(1.6		)	241.6
Earnings available for common stock									151.0