Revenues

3 Months Ended

Mar. 31, 2020

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

REVENUES

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy				IPL				WPL
Three Months Ended March 31	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$266.8		$274.7		$147.4		$147.5		$119.4		$127.2
Retail - commercial	182.3		181.1		119.7		116.6		62.6		64.5
Retail - industrial	209.9		208.7		121.2		116.1		88.7		92.6
Wholesale	40.9		46.5		14.4		16.9		26.5		29.6
Bulk power and other	30.4		32.4		22.1		22.7		8.3		9.7
Total Electric Utility	730.3		743.4		424.8		419.8		305.5		323.6
Gas Utility:
Retail - residential	90.5		131.8		48.8		77.9		41.7		53.9
Retail - commercial	45.7		63.6		24.1		34.8		21.6		28.8
Retail - industrial	4.2		5.4		2.3		3.2		1.9		2.2
Transportation/other	11.8		15.0		7.8		8.7		4.0		6.3
Total Gas Utility	152.2		215.8		83.0		124.6		69.2		91.2
Other Utility:
Steam	10.0		8.4		10.0		8.4		—		—
Other utility	1.6		2.7		1.1		2.3		0.5		0.4
Total Other Utility	11.6		11.1		11.1		10.7		0.5		0.4
Non-Utility and Other:
Transportation and other	21.6		16.9		—		—		—		—
Total Non-Utility and Other	21.6		16.9		—		—		—		—
Total revenues		$915.7		$987.2		$518.9		$555.1		$375.2		$415.2

IPL [Member]

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

REVENUES

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy				IPL				WPL
Three Months Ended March 31	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$266.8		$274.7		$147.4		$147.5		$119.4		$127.2
Retail - commercial	182.3		181.1		119.7		116.6		62.6		64.5
Retail - industrial	209.9		208.7		121.2		116.1		88.7		92.6
Wholesale	40.9		46.5		14.4		16.9		26.5		29.6
Bulk power and other	30.4		32.4		22.1		22.7		8.3		9.7
Total Electric Utility	730.3		743.4		424.8		419.8		305.5		323.6
Gas Utility:
Retail - residential	90.5		131.8		48.8		77.9		41.7		53.9
Retail - commercial	45.7		63.6		24.1		34.8		21.6		28.8
Retail - industrial	4.2		5.4		2.3		3.2		1.9		2.2
Transportation/other	11.8		15.0		7.8		8.7		4.0		6.3
Total Gas Utility	152.2		215.8		83.0		124.6		69.2		91.2
Other Utility:
Steam	10.0		8.4		10.0		8.4		—		—
Other utility	1.6		2.7		1.1		2.3		0.5		0.4
Total Other Utility	11.6		11.1		11.1		10.7		0.5		0.4
Non-Utility and Other:
Transportation and other	21.6		16.9		—		—		—		—
Total Non-Utility and Other	21.6		16.9		—		—		—		—
Total revenues		$915.7		$987.2		$518.9		$555.1		$375.2		$415.2

WPL [Member]

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

REVENUES

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy				IPL				WPL
Three Months Ended March 31	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$266.8		$274.7		$147.4		$147.5		$119.4		$127.2
Retail - commercial	182.3		181.1		119.7		116.6		62.6		64.5
Retail - industrial	209.9		208.7		121.2		116.1		88.7		92.6
Wholesale	40.9		46.5		14.4		16.9		26.5		29.6
Bulk power and other	30.4		32.4		22.1		22.7		8.3		9.7
Total Electric Utility	730.3		743.4		424.8		419.8		305.5		323.6
Gas Utility:
Retail - residential	90.5		131.8		48.8		77.9		41.7		53.9
Retail - commercial	45.7		63.6		24.1		34.8		21.6		28.8
Retail - industrial	4.2		5.4		2.3		3.2		1.9		2.2
Transportation/other	11.8		15.0		7.8		8.7		4.0		6.3
Total Gas Utility	152.2		215.8		83.0		124.6		69.2		91.2
Other Utility:
Steam	10.0		8.4		10.0		8.4		—		—
Other utility	1.6		2.7		1.1		2.3		0.5		0.4
Total Other Utility	11.6		11.1		11.1		10.7		0.5		0.4
Non-Utility and Other:
Transportation and other	21.6		16.9		—		—		—		—
Total Non-Utility and Other	21.6		16.9		—		—		—		—
Total revenues		$915.7		$987.2		$518.9		$555.1		$375.2		$415.2