Segments Of Business (Tables)

3 Months Ended

Mar. 31, 2019

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.

									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Three Months Ended March 31, 2019
Revenues		$743.4		$215.8		$11.1		$970.3		$16.9		$987.2
Operating income	126.4		45.2		—		171.6		5.2		176.8
Net income attributable to Alliant Energy common shareowners							119.0		6.1		125.1
Three Months Ended March 31, 2018
Revenues		$708.7		$185.6		$13.2		$907.5		$8.8		$916.3
Operating income	126.7		31.5		1.4		159.6		6.1		165.7
Net income attributable to Alliant Energy common shareowners							100.7		20.2		120.9

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, 2019
Revenues		$419.8		$124.6		$10.7		$555.1
Operating income	46.8		26.3		0.4		73.5
Earnings available for common stock							53.3
Three Months Ended March 31, 2018
Revenues		$405.7		$108.1		$12.0		$525.8
Operating income	57.5		16.9		1.2		75.6
Earnings available for common stock							46.7

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, 2019
Revenues		$323.6		$91.2		$0.4			$415.2
Operating income (loss)	79.6		18.9		(0.4		)	98.1
Earnings available for common stock								65.7
Three Months Ended March 31, 2018
Revenues		$303.0		$77.5		$1.2			$381.7
Operating income	69.2		14.6		0.2			84.0
Earnings available for common stock								54.0