Segments Of Business (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2020
Revenues		$675.2		$58.9		$10.1		$744.2		$18.9		$763.1
Operating income	152.1		7.1		1.2		160.4		7.7		168.1
Net income attributable to Alliant Energy common shareowners							117.4		17.0		134.4
Three Months Ended June 30, 2019
Revenues		$691.2		$65.2		$10.9		$767.3		$22.9		$790.2
Operating income	132.9		7.2		1.4		141.5		8.3		149.8
Net income attributable to Alliant Energy common shareowners							87.0		7.6		94.6

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Six Months Ended June 30, 2020
Revenues		$1,405.5		$211.1		$21.7		$1,638.3		$40.5		$1,678.8
Operating income	298.3		48.7		3.9		350.9		5.5		356.4
Net income attributable to Alliant Energy common shareowners							289.6		14.8		304.4
Six Months Ended June 30, 2019
Revenues		$1,434.6		$281.0		$22.0		$1,737.6		$39.8		$1,777.4
Operating income	259.3		52.4		1.4		313.1		13.5		326.6
Net income attributable to Alliant Energy common shareowners							206.0		13.7		219.7

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$388.4		$33.9		$9.6		$431.9
Operating income	82.1		5.2		1.4		88.7
Net income available for common stock							59.8
Three Months Ended June 30, 2019
Revenues		$392.3		$38.4		$10.5		$441.2
Operating income	68.9		4.2		1.4		74.5
Net income available for common stock							45.0
Six Months Ended June 30, 2020
Revenues		$813.2		$116.9		$20.7		$950.8
Operating income	149.1		32.5		3.8		185.4
Net income available for common stock							142.4
Six Months Ended June 30, 2019
Revenues		$812.1		$163.0		$21.2		$996.3
Operating income	115.7		30.5		1.8		148.0
Net income available for common stock							98.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$286.8		$25.0		$0.5			$312.3
Operating income (loss)	70.0		1.9		(0.2		)	71.7
Net income								57.6
Three Months Ended June 30, 2019
Revenues		$298.9		$26.8		$0.4			$326.1
Operating income	64.0		3.0		—			67.0
Net income								42.0
Six Months Ended June 30, 2020
Revenues		$592.3		$94.2		$1.0			$687.5
Operating income	149.2		16.2		0.1			165.5
Net income								147.2
Six Months Ended June 30, 2019
Revenues		$622.5		$118.0		$0.8			$741.3
Operating income (loss)	143.6		21.9		(0.4		)	165.1
Net income								107.7

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 June 30, 2020
Revenues		$675.2		$58.9		$10.1		$744.2		$18.9		$763.1
Operating income	152.1		7.1		1.2		160.4		7.7		168.1
Net income attributable to Alliant Energy common shareowners							117.4		17.0		134.4
Three Months Ended June 30, 2019
Revenues		$691.2		$65.2		$10.9		$767.3		$22.9		$790.2
Operating income	132.9		7.2		1.4		141.5		8.3		149.8
Net income attributable to Alliant Energy common shareowners							87.0		7.6		94.6

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Six Months Ended June 30, 2020
Revenues		$1,405.5		$211.1		$21.7		$1,638.3		$40.5		$1,678.8
Operating income	298.3		48.7		3.9		350.9		5.5		356.4
Net income attributable to Alliant Energy common shareowners							289.6		14.8		304.4
Six Months Ended June 30, 2019
Revenues		$1,434.6		$281.0		$22.0		$1,737.6		$39.8		$1,777.4
Operating income	259.3		52.4		1.4		313.1		13.5		326.6
Net income attributable to Alliant Energy common shareowners							206.0		13.7		219.7

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$388.4		$33.9		$9.6		$431.9
Operating income	82.1		5.2		1.4		88.7
Net income available for common stock							59.8
Three Months Ended June 30, 2019
Revenues		$392.3		$38.4		$10.5		$441.2
Operating income	68.9		4.2		1.4		74.5
Net income available for common stock							45.0
Six Months Ended June 30, 2020
Revenues		$813.2		$116.9		$20.7		$950.8
Operating income	149.1		32.5		3.8		185.4
Net income available for common stock							142.4
Six Months Ended June 30, 2019
Revenues		$812.1		$163.0		$21.2		$996.3
Operating income	115.7		30.5		1.8		148.0
Net income available for common stock							98.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$286.8		$25.0		$0.5			$312.3
Operating income (loss)	70.0		1.9		(0.2		)	71.7
Net income								57.6
Three Months Ended June 30, 2019
Revenues		$298.9		$26.8		$0.4			$326.1
Operating income	64.0		3.0		—			67.0
Net income								42.0
Six Months Ended June 30, 2020
Revenues		$592.3		$94.2		$1.0			$687.5
Operating income	149.2		16.2		0.1			165.5
Net income								147.2
Six Months Ended June 30, 2019
Revenues		$622.5		$118.0		$0.8			$741.3
Operating income (loss)	143.6		21.9		(0.4		)	165.1
Net income								107.7

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 June 30, 2020
Revenues		$675.2		$58.9		$10.1		$744.2		$18.9		$763.1
Operating income	152.1		7.1		1.2		160.4		7.7		168.1
Net income attributable to Alliant Energy common shareowners							117.4		17.0		134.4
Three Months Ended June 30, 2019
Revenues		$691.2		$65.2		$10.9		$767.3		$22.9		$790.2
Operating income	132.9		7.2		1.4		141.5		8.3		149.8
Net income attributable to Alliant Energy common shareowners							87.0		7.6		94.6

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Six Months Ended June 30, 2020
Revenues		$1,405.5		$211.1		$21.7		$1,638.3		$40.5		$1,678.8
Operating income	298.3		48.7		3.9		350.9		5.5		356.4
Net income attributable to Alliant Energy common shareowners							289.6		14.8		304.4
Six Months Ended June 30, 2019
Revenues		$1,434.6		$281.0		$22.0		$1,737.6		$39.8		$1,777.4
Operating income	259.3		52.4		1.4		313.1		13.5		326.6
Net income attributable to Alliant Energy common shareowners							206.0		13.7		219.7

IPL	Electric		Gas		Other		Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$388.4		$33.9		$9.6		$431.9
Operating income	82.1		5.2		1.4		88.7
Net income available for common stock							59.8
Three Months Ended June 30, 2019
Revenues		$392.3		$38.4		$10.5		$441.2
Operating income	68.9		4.2		1.4		74.5
Net income available for common stock							45.0
Six Months Ended June 30, 2020
Revenues		$813.2		$116.9		$20.7		$950.8
Operating income	149.1		32.5		3.8		185.4
Net income available for common stock							142.4
Six Months Ended June 30, 2019
Revenues		$812.1		$163.0		$21.2		$996.3
Operating income	115.7		30.5		1.8		148.0
Net income available for common stock							98.3

WPL	Electric		Gas		Other			Total
	(in millions)
Three Months Ended June 30, 2020
Revenues		$286.8		$25.0		$0.5			$312.3
Operating income (loss)	70.0		1.9		(0.2		)	71.7
Net income								57.6
Three Months Ended June 30, 2019
Revenues		$298.9		$26.8		$0.4			$326.1
Operating income	64.0		3.0		—			67.0
Net income								42.0
Six Months Ended June 30, 2020
Revenues		$592.3		$94.2		$1.0			$687.5
Operating income	149.2		16.2		0.1			165.5
Net income								147.2
Six Months Ended June 30, 2019
Revenues		$622.5		$118.0		$0.8			$741.3
Operating income (loss)	143.6		21.9		(0.4		)	165.1
Net income								107.7