Segments Of Business

3 Months Ended

Mar. 31, 2017

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 (a)								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2017
Operating revenues		$677.6		$154.3		$11.7		$843.6		$10.3			$853.9
Operating income	107.2		28.0		0.4		135.6		7.3			142.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							89.6		9.4			99.0
Income from discontinued operations, net of tax							—		1.4			1.4
Net income							89.6		10.8			100.4
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

(a) Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.

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 March 31, 2017
Operating revenues		$356.2		$83.1		$11.2		$450.5
Operating income	33.8		14.4		1.4		49.6
Earnings available for common stock							37.2
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

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 March 31, 2017
Operating revenues		$321.4		$71.2		$0.5			$393.1
Operating income (loss)	73.4		13.6		(1.0		)	86.0
Earnings available for common stock								45.5
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

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 (a)								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2017
Operating revenues		$677.6		$154.3		$11.7		$843.6		$10.3			$853.9
Operating income	107.2		28.0		0.4		135.6		7.3			142.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							89.6		9.4			99.0
Income from discontinued operations, net of tax							—		1.4			1.4
Net income							89.6		10.8			100.4
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

(a) Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.

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 March 31, 2017
Operating revenues		$356.2		$83.1		$11.2		$450.5
Operating income	33.8		14.4		1.4		49.6
Earnings available for common stock							37.2
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

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 March 31, 2017
Operating revenues		$321.4		$71.2		$0.5			$393.1
Operating income (loss)	73.4		13.6		(1.0		)	86.0
Earnings available for common stock								45.5
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

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 (a)								Non-Regulated,			Alliant Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2017
Operating revenues		$677.6		$154.3		$11.7		$843.6		$10.3			$853.9
Operating income	107.2		28.0		0.4		135.6		7.3			142.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax							89.6		9.4			99.0
Income from discontinued operations, net of tax							—		1.4			1.4
Net income							89.6		10.8			100.4
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

(a) Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.

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 March 31, 2017
Operating revenues		$356.2		$83.1		$11.2		$450.5
Operating income	33.8		14.4		1.4		49.6
Earnings available for common stock							37.2
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

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 March 31, 2017
Operating revenues		$321.4		$71.2		$0.5			$393.1
Operating income (loss)	73.4		13.6		(1.0		)	86.0
Earnings available for common stock								45.5
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