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Segments Of Business (Tables)

6 Months Ended

Jun. 30, 2017

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 (a)																Non-Regulated,				Alliant Energy
	Electric				Gas				Other				Total				Parent and Other				Consolidated
	(in millions)
Three Months Ended June 30, 2017
Operating revenues		$680.9				$62.6				$11.5				$755.0				$10.3				$765.3
Operating income	135.6				3.9				0.5				140.0				9.3				149.3
Net income attributable to Alliant Energy common shareowners													87.6				6.7				94.3
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

	Utility (a)																Non-Regulated,				Alliant Energy
	Electric				Gas				Other				Total				Parent and Other				Consolidated
	(in millions)
Six Months Ended June 30, 2017
Operating revenues		$1,358.5				$216.9				$23.2				$1,598.6				$20.6				$1,619.2
Operating income	242.8				31.9				0.9				275.6				16.6				292.2
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax													177.2				16.1				193.3
Income from discontinued operations, net of tax													—				1.4				1.4
Net income													177.2				17.5				194.7
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

(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 [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, 2017
Operating revenues		$372.4				$36.7				$11.1				$420.2
Operating income	62.4				2.4				1.5				66.3
Earnings available for common stock													42.8
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
Six Months Ended June 30, 2017
Operating revenues		$728.6				$119.8				$22.3				$870.7
Operating income	96.2				16.8				2.9				115.9
Earnings available for common stock													80.0
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

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, 2017
Operating revenues		$308.5				$25.9				$0.4				$334.8
Operating income (loss)	73.2				1.5				(1.0		)		73.7
Earnings available for common stock													38.1
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
Six Months Ended June 30, 2017
Operating revenues		$629.9				$97.1				$0.9				$727.9
Operating income (loss)	146.6				15.1				(2.0		)		159.7
Earnings available for common stock													83.6
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

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599

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