Revenues

6 Months Ended

Jun. 30, 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 June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$249.7		$233.3		$135.3		$125.9		$114.4		$107.4
Retail - commercial	164.0		171.3		109.0		111.4		55.0		59.9
Retail - industrial	197.3		214.2		114.3		118.4		83.0		95.8
Wholesale	39.1		41.0		13.0		14.6		26.1		26.4
Bulk power and other	25.1		31.4		16.8		22.0		8.3		9.4
Total Electric Utility	675.2		691.2		388.4		392.3		286.8		298.9
Gas Utility:
Retail - residential	33.6		35.2		18.5		20.0		15.1		15.2
Retail - commercial	14.7		16.1		8.3		8.8		6.4		7.3
Retail - industrial	1.7		2.0		1.3		1.6		0.4		0.4
Transportation/other	8.9		11.9		5.8		8.0		3.1		3.9
Total Gas Utility	58.9		65.2		33.9		38.4		25.0		26.8
Other Utility:
Steam	8.6		9.2		8.6		9.2		—		—
Other utility	1.5		1.7		1.0		1.3		0.5		0.4
Total Other Utility	10.1		10.9		9.6		10.5		0.5		0.4
Non-Utility and Other:
Transportation and other	18.9		22.9		—		—		—		—
Total Non-Utility and Other	18.9		22.9		—		—		—		—
Total revenues		$763.1		$790.2		$431.9		$441.2		$312.3		$326.1

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$516.5		$508.0		$282.7		$273.4		$233.8		$234.6
Retail - commercial	346.3		352.4		228.7		228.0		117.6		124.4
Retail - industrial	407.2		422.9		235.5		234.5		171.7		188.4
Wholesale	80.0		87.5		27.4		31.5		52.6		56.0
Bulk power and other	55.5		63.8		38.9		44.7		16.6		19.1
Total Electric Utility	1,405.5		1,434.6		813.2		812.1		592.3		622.5
Gas Utility:
Retail - residential	124.1		167.0		67.3		97.9		56.8		69.1
Retail - commercial	60.4		79.7		32.4		43.6		28.0		36.1
Retail - industrial	5.9		7.4		3.6		4.8		2.3		2.6
Transportation/other	20.7		26.9		13.6		16.7		7.1		10.2
Total Gas Utility	211.1		281.0		116.9		163.0		94.2		118.0
Other Utility:
Steam	18.6		17.6		18.6		17.6		—		—
Other utility	3.1		4.4		2.1		3.6		1.0		0.8
Total Other Utility	21.7		22.0		20.7		21.2		1.0		0.8
Non-Utility and Other:
Transportation and other	40.5		39.8		—		—		—		—
Total Non-Utility and Other	40.5		39.8		—		—		—		—
Total revenues		$1,678.8		$1,777.4		$950.8		$996.3		$687.5		$741.3

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 June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$249.7		$233.3		$135.3		$125.9		$114.4		$107.4
Retail - commercial	164.0		171.3		109.0		111.4		55.0		59.9
Retail - industrial	197.3		214.2		114.3		118.4		83.0		95.8
Wholesale	39.1		41.0		13.0		14.6		26.1		26.4
Bulk power and other	25.1		31.4		16.8		22.0		8.3		9.4
Total Electric Utility	675.2		691.2		388.4		392.3		286.8		298.9
Gas Utility:
Retail - residential	33.6		35.2		18.5		20.0		15.1		15.2
Retail - commercial	14.7		16.1		8.3		8.8		6.4		7.3
Retail - industrial	1.7		2.0		1.3		1.6		0.4		0.4
Transportation/other	8.9		11.9		5.8		8.0		3.1		3.9
Total Gas Utility	58.9		65.2		33.9		38.4		25.0		26.8
Other Utility:
Steam	8.6		9.2		8.6		9.2		—		—
Other utility	1.5		1.7		1.0		1.3		0.5		0.4
Total Other Utility	10.1		10.9		9.6		10.5		0.5		0.4
Non-Utility and Other:
Transportation and other	18.9		22.9		—		—		—		—
Total Non-Utility and Other	18.9		22.9		—		—		—		—
Total revenues		$763.1		$790.2		$431.9		$441.2		$312.3		$326.1

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$516.5		$508.0		$282.7		$273.4		$233.8		$234.6
Retail - commercial	346.3		352.4		228.7		228.0		117.6		124.4
Retail - industrial	407.2		422.9		235.5		234.5		171.7		188.4
Wholesale	80.0		87.5		27.4		31.5		52.6		56.0
Bulk power and other	55.5		63.8		38.9		44.7		16.6		19.1
Total Electric Utility	1,405.5		1,434.6		813.2		812.1		592.3		622.5
Gas Utility:
Retail - residential	124.1		167.0		67.3		97.9		56.8		69.1
Retail - commercial	60.4		79.7		32.4		43.6		28.0		36.1
Retail - industrial	5.9		7.4		3.6		4.8		2.3		2.6
Transportation/other	20.7		26.9		13.6		16.7		7.1		10.2
Total Gas Utility	211.1		281.0		116.9		163.0		94.2		118.0
Other Utility:
Steam	18.6		17.6		18.6		17.6		—		—
Other utility	3.1		4.4		2.1		3.6		1.0		0.8
Total Other Utility	21.7		22.0		20.7		21.2		1.0		0.8
Non-Utility and Other:
Transportation and other	40.5		39.8		—		—		—		—
Total Non-Utility and Other	40.5		39.8		—		—		—		—
Total revenues		$1,678.8		$1,777.4		$950.8		$996.3		$687.5		$741.3

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 June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$249.7		$233.3		$135.3		$125.9		$114.4		$107.4
Retail - commercial	164.0		171.3		109.0		111.4		55.0		59.9
Retail - industrial	197.3		214.2		114.3		118.4		83.0		95.8
Wholesale	39.1		41.0		13.0		14.6		26.1		26.4
Bulk power and other	25.1		31.4		16.8		22.0		8.3		9.4
Total Electric Utility	675.2		691.2		388.4		392.3		286.8		298.9
Gas Utility:
Retail - residential	33.6		35.2		18.5		20.0		15.1		15.2
Retail - commercial	14.7		16.1		8.3		8.8		6.4		7.3
Retail - industrial	1.7		2.0		1.3		1.6		0.4		0.4
Transportation/other	8.9		11.9		5.8		8.0		3.1		3.9
Total Gas Utility	58.9		65.2		33.9		38.4		25.0		26.8
Other Utility:
Steam	8.6		9.2		8.6		9.2		—		—
Other utility	1.5		1.7		1.0		1.3		0.5		0.4
Total Other Utility	10.1		10.9		9.6		10.5		0.5		0.4
Non-Utility and Other:
Transportation and other	18.9		22.9		—		—		—		—
Total Non-Utility and Other	18.9		22.9		—		—		—		—
Total revenues		$763.1		$790.2		$431.9		$441.2		$312.3		$326.1

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2020		2019		2020		2019		2020		2019
Electric Utility:
Retail - residential		$516.5		$508.0		$282.7		$273.4		$233.8		$234.6
Retail - commercial	346.3		352.4		228.7		228.0		117.6		124.4
Retail - industrial	407.2		422.9		235.5		234.5		171.7		188.4
Wholesale	80.0		87.5		27.4		31.5		52.6		56.0
Bulk power and other	55.5		63.8		38.9		44.7		16.6		19.1
Total Electric Utility	1,405.5		1,434.6		813.2		812.1		592.3		622.5
Gas Utility:
Retail - residential	124.1		167.0		67.3		97.9		56.8		69.1
Retail - commercial	60.4		79.7		32.4		43.6		28.0		36.1
Retail - industrial	5.9		7.4		3.6		4.8		2.3		2.6
Transportation/other	20.7		26.9		13.6		16.7		7.1		10.2
Total Gas Utility	211.1		281.0		116.9		163.0		94.2		118.0
Other Utility:
Steam	18.6		17.6		18.6		17.6		—		—
Other utility	3.1		4.4		2.1		3.6		1.0		0.8
Total Other Utility	21.7		22.0		20.7		21.2		1.0		0.8
Non-Utility and Other:
Transportation and other	40.5		39.8		—		—		—		—
Total Non-Utility and Other	40.5		39.8		—		—		—		—
Total revenues		$1,678.8		$1,777.4		$950.8		$996.3		$687.5		$741.3