Segments Of Business (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2016
Operating revenues		$675.9		$57.0			$12.4		$745.3		$9.3			$754.6
Operating income	119.3		1.9			1.8		123.0		5.6			128.6
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax								75.1		9.3			84.4
Loss from discontinued operations, net of tax								—		(0.5		)	(0.5		)
Net income								75.1		8.8			83.9
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

	Utility								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Six Months Ended June 30, 2016
Operating revenues		$1,344.8		$209.2		$25.6		$1,579.6		$18.8			$1,598.4
Operating income	229.1		30.7		4.0		263.8		10.7			274.5
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							167.2		14.8			182.0
Loss from discontinued operations, net of tax							—		(1.6		)	(1.6		)
Net income							167.2		13.2			180.4
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

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 June 30, 2016
Operating revenues		$364.4		$34.5			$12.1		$411.0
Operating income	44.5		0.9			2.6		48.0
Earnings available for common stock								31.9
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								16.5
Six Months Ended June 30, 2016
Operating revenues		$726.0		$118.7			$25.0		$869.7
Operating income	87.9		16.7			5.4		110.0
Earnings available for common stock								77.5
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								64.0

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 June 30, 2016
Operating revenues		$311.5		$22.5		$0.3			$334.3
Operating income (loss)	74.8		1.0		(0.8		)	75.0
Earnings available for common stock								43.2
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								39.2
Six Months Ended June 30, 2016
Operating revenues		$618.8		$90.5		$0.6			$709.9
Operating income (loss)	141.2		14.0		(1.4		)	153.8
Earnings available for common stock								89.7
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								84.1