Segments Of Business (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy									ATC Holdings,			Alliant
	Utility								Non-Utility,			Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2020
Revenues		$730.3		$152.2		$11.6		$894.1		$21.6			$915.7
Operating income (loss)	146.2		41.6		2.7		190.5		(2.2		)	188.3
Net income (loss) attributable to Alliant Energy common shareowners							172.2		(2.2		)	170.0
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

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$424.8		$83.0		$11.1		$518.9
Operating income	67.0		27.3		2.4		96.7
Net income available for common stock							82.6
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
Net income available for common stock							53.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$305.5		$69.2		$0.5			$375.2
Operating income	79.2		14.3		0.3			93.8
Net income								89.6
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
Net income								65.7

IPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy									ATC Holdings,			Alliant
	Utility								Non-Utility,			Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2020
Revenues		$730.3		$152.2		$11.6		$894.1		$21.6			$915.7
Operating income (loss)	146.2		41.6		2.7		190.5		(2.2		)	188.3
Net income (loss) attributable to Alliant Energy common shareowners							172.2		(2.2		)	170.0
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

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$424.8		$83.0		$11.1		$518.9
Operating income	67.0		27.3		2.4		96.7
Net income available for common stock							82.6
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
Net income available for common stock							53.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$305.5		$69.2		$0.5			$375.2
Operating income	79.2		14.3		0.3			93.8
Net income								89.6
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
Net income								65.7

WPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy									ATC Holdings,			Alliant
	Utility								Non-Utility,			Energy
	Electric		Gas		Other		Total		Parent and Other			Consolidated
	(in millions)
Three Months Ended March 31, 2020
Revenues		$730.3		$152.2		$11.6		$894.1		$21.6			$915.7
Operating income (loss)	146.2		41.6		2.7		190.5		(2.2		)	188.3
Net income (loss) attributable to Alliant Energy common shareowners							172.2		(2.2		)	170.0
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

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$424.8		$83.0		$11.1		$518.9
Operating income	67.0		27.3		2.4		96.7
Net income available for common stock							82.6
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
Net income available for common stock							53.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2020
Revenues		$305.5		$69.2		$0.5			$375.2
Operating income	79.2		14.3		0.3			93.8
Net income								89.6
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
Net income								65.7