Segments Of Business (Tables)

6 Months Ended

Jun. 30, 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 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
Three Months Ended June 30, 2018
Revenues		$726.3		$68.6		$10.7		$805.6		$10.5		$816.1
Operating income	134.8		5.4		0.9		141.1		10.1		151.2
Net income attributable to Alliant Energy common shareowners							91.5		8.9		100.4

									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
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
Six Months Ended June 30, 2018
Revenues		$1,435.0		$254.2		$23.9		$1,713.1		$19.3		$1,732.4
Operating income	261.5		36.9		2.3		300.7		16.2		316.9
Net income attributable to Alliant Energy common shareowners							192.2		29.1		221.3

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, 2019
Revenues		$392.3		$38.4		$10.5		$441.2
Operating income	68.9		4.2		1.4		74.5
Earnings available for common stock							45.0
Three Months Ended June 30, 2018
Revenues		$422.1		$42.2		$10.5		$474.8
Operating income	73.5		2.5		1.7		77.7
Earnings available for common stock							51.7
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
Earnings available for common stock							98.3
Six Months Ended June 30, 2018
Revenues		$827.8		$150.3		$22.5		$1,000.6
Operating income	131.0		19.4		2.9		153.3
Earnings available for common stock							98.4

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, 2019
Revenues		$298.9		$26.8		$0.4			$326.1
Operating income	64.0		3.0		—			67.0
Earnings available for common stock								42.0
Three Months Ended June 30, 2018
Revenues		$304.2		$26.4		$0.2			$330.8
Operating income (loss)	61.3		2.9		(0.8		)	63.4
Earnings available for common stock								39.8
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
Earnings available for common stock								107.7
Six Months Ended June 30, 2018
Revenues		$607.2		$103.9		$1.4			$712.5
Operating income (loss)	130.5		17.5		(0.6		)	147.4
Earnings available for common stock								93.8