Segments Of Business

6 Months Ended

Jun. 30, 2014

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.

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							53.0		8.8			61.8
Three Months Ended June 30, 2013
Operating revenues		$612.1		$73.4		$17.8		$703.3		$14.7			$718.0
Operating income	85.9		5.6		2.9		94.4		8.8			103.2
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							56.6		9.3			65.9
Loss from discontinued operations, net of tax							—		(0.6		)	(0.6		)
Net income attributable to Alliant Energy common shareowners							56.6		8.7			65.3

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							151.2		18.6			169.8
Six Months Ended June 30, 2013
Operating revenues		$1,245.3		$270.7		$35.0		$1,551.0		$26.6			$1,577.6
Operating income	159.5		42.9		5.8		208.2		15.7			223.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							121.5		17.3			138.8
Loss from discontinued operations, net of tax							—		(3.6		)	(3.6		)
Net income attributable to Alliant Energy common shareowners							121.5		13.7			135.2

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, 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
Three Months Ended June 30, 2013
Operating revenues		$329.6		$42.0		$11.8		$383.4
Operating income	29.4		2.6		2.7		34.7
Earnings available for common stock							22.2
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
Six Months Ended June 30, 2013
Operating revenues		$679.8		$156.3		$25.2		$861.3
Operating income	46.6		23.3		5.9		75.8
Earnings available for common stock							45.1

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, 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
Three Months Ended June 30, 2013
Operating revenues		$282.5		$31.4		$6.0			$319.9
Operating income	56.5		3.0		0.2			59.7
Earnings available for common stock								34.4
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
Six Months Ended June 30, 2013
Operating revenues		$565.5		$114.4		$9.8			$689.7
Operating income (loss)	112.9		19.6		(0.1		)	132.4
Earnings available for common stock								76.4

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.

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							53.0		8.8			61.8
Three Months Ended June 30, 2013
Operating revenues		$612.1		$73.4		$17.8		$703.3		$14.7			$718.0
Operating income	85.9		5.6		2.9		94.4		8.8			103.2
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							56.6		9.3			65.9
Loss from discontinued operations, net of tax							—		(0.6		)	(0.6		)
Net income attributable to Alliant Energy common shareowners							56.6		8.7			65.3

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							151.2		18.6			169.8
Six Months Ended June 30, 2013
Operating revenues		$1,245.3		$270.7		$35.0		$1,551.0		$26.6			$1,577.6
Operating income	159.5		42.9		5.8		208.2		15.7			223.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							121.5		17.3			138.8
Loss from discontinued operations, net of tax							—		(3.6		)	(3.6		)
Net income attributable to Alliant Energy common shareowners							121.5		13.7			135.2

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, 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
Three Months Ended June 30, 2013
Operating revenues		$329.6		$42.0		$11.8		$383.4
Operating income	29.4		2.6		2.7		34.7
Earnings available for common stock							22.2
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
Six Months Ended June 30, 2013
Operating revenues		$679.8		$156.3		$25.2		$861.3
Operating income	46.6		23.3		5.9		75.8
Earnings available for common stock							45.1

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, 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
Three Months Ended June 30, 2013
Operating revenues		$282.5		$31.4		$6.0			$319.9
Operating income	56.5		3.0		0.2			59.7
Earnings available for common stock								34.4
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
Six Months Ended June 30, 2013
Operating revenues		$565.5		$114.4		$9.8			$689.7
Operating income (loss)	112.9		19.6		(0.1		)	132.4
Earnings available for common stock								76.4

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.

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							53.0		8.8			61.8
Three Months Ended June 30, 2013
Operating revenues		$612.1		$73.4		$17.8		$703.3		$14.7			$718.0
Operating income	85.9		5.6		2.9		94.4		8.8			103.2
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							56.6		9.3			65.9
Loss from discontinued operations, net of tax							—		(0.6		)	(0.6		)
Net income attributable to Alliant Energy common shareowners							56.6		8.7			65.3

	Utilities								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
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 attributable to Alliant Energy common shareowners							151.2		18.6			169.8
Six Months Ended June 30, 2013
Operating revenues		$1,245.3		$270.7		$35.0		$1,551.0		$26.6			$1,577.6
Operating income	159.5		42.9		5.8		208.2		15.7			223.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							121.5		17.3			138.8
Loss from discontinued operations, net of tax							—		(3.6		)	(3.6		)
Net income attributable to Alliant Energy common shareowners							121.5		13.7			135.2

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, 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
Three Months Ended June 30, 2013
Operating revenues		$329.6		$42.0		$11.8		$383.4
Operating income	29.4		2.6		2.7		34.7
Earnings available for common stock							22.2
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
Six Months Ended June 30, 2013
Operating revenues		$679.8		$156.3		$25.2		$861.3
Operating income	46.6		23.3		5.9		75.8
Earnings available for common stock							45.1

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, 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
Three Months Ended June 30, 2013
Operating revenues		$282.5		$31.4		$6.0			$319.9
Operating income	56.5		3.0		0.2			59.7
Earnings available for common stock								34.4
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
Six Months Ended June 30, 2013
Operating revenues		$565.5		$114.4		$9.8			$689.7
Operating income (loss)	112.9		19.6		(0.1		)	132.4
Earnings available for common stock								76.4