Segments Of Business (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

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 March 31, 2016
Operating revenues		$668.9		$152.2		$13.2		$834.3		$9.5			$843.8
Operating income	109.8		28.8		2.2		140.8		5.1			145.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							92.1		5.5			97.6
Loss from discontinued operations, net of tax							—		(1.1		)	(1.1		)
Net income							92.1		4.4			96.5
Three Months Ended March 31, 2015
Operating revenues		$671.3		$198.4		$16.4		$886.1		$11.3			$897.4
Operating income	104.7		36.3		5.3		146.3		6.6			152.9
Net income attributable to Alliant Energy common shareowners							92.4		4.2			96.6

IPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

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 March 31, 2016
Operating revenues		$361.6		$84.2		$12.9		$458.7
Operating income	43.4		15.8		2.8		62.0
Earnings available for common stock							45.6
Three Months Ended March 31, 2015
Operating revenues		$362.6		$111.2		$15.2		$489.0
Operating income	40.3		20.6		4.6		65.5
Earnings available for common stock							47.5

WPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

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 March 31, 2016
Operating revenues		$307.3		$68.0		$0.3			$375.6
Operating income (loss)	66.4		13.0		(0.6		)	78.8
Earnings available for common stock								46.5
Three Months Ended March 31, 2015
Operating revenues		$308.7		$87.2		$1.2			$397.1
Operating income	64.4		15.7		0.7			80.8
Earnings available for common stock								44.9