Revenues

6 Months Ended

Jun. 30, 2019

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer

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	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$233.3		$248.3		$125.9		$139.3		$107.4		$109.0
Retail - commercial	171.3		172.3		111.4		114.2		59.9		58.1
Retail - industrial	214.2		225.4		118.4		128.8		95.8		96.6
Wholesale	41.0		43.1		14.6		13.9		26.4		29.2
Bulk power and other	31.4		37.2		22.0		25.9		9.4		11.3
Total Electric Utility	691.2		726.3		392.3		422.1		298.9		304.2
Gas Utility:
Retail - residential	35.2		37.7		20.0		22.8		15.2		14.9
Retail - commercial	16.1		19.3		8.8		11.8		7.3		7.5
Retail - industrial	2.0		2.6		1.6		1.4		0.4		1.2
Transportation/other	11.9		9.0		8.0		6.2		3.9		2.8
Total Gas Utility	65.2		68.6		38.4		42.2		26.8		26.4
Other Utility:
Steam	9.2		8.4		9.2		8.4		—		—
Other utility	1.7		2.3		1.3		2.1		0.4		0.2
Total Other Utility	10.9		10.7		10.5		10.5		0.4		0.2
Non-Utility and Other:
Transportation and other	22.9		10.5		—		—		—		—
Total Non-Utility and Other	22.9		10.5		—		—		—		—
Total revenues		$790.2		$816.1		$441.2		$474.8		$326.1		$330.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$508.0		$507.7		$273.4		$281.5		$234.6		$226.2
Retail - commercial	352.4		346.3		228.0		225.8		124.4		120.5
Retail - industrial	422.9		427.3		234.5		243.6		188.4		183.7
Wholesale	87.5		96.9		31.5		38.2		56.0		58.7
Bulk power and other	63.8		56.8		44.7		38.7		19.1		18.1
Total Electric Utility	1,434.6		1,435.0		812.1		827.8		622.5		607.2
Gas Utility:
Retail - residential	167.0		148.3		97.9		88.3		69.1		60.0
Retail - commercial	79.7		76.3		43.6		43.4		36.1		32.9
Retail - industrial	7.4		8.4		4.8		4.1		2.6		4.3
Transportation/other	26.9		21.2		16.7		14.5		10.2		6.7
Total Gas Utility	281.0		254.2		163.0		150.3		118.0		103.9
Other Utility:
Steam	17.6		17.8		17.6		17.8		—		—
Other utility	4.4		6.1		3.6		4.7		0.8		1.4
Total Other Utility	22.0		23.9		21.2		22.5		0.8		1.4
Non-Utility and Other:
Transportation and other	39.8		19.3		—		—		—		—
Total Non-Utility and Other	39.8		19.3		—		—		—		—
Total revenues		$1,777.4		$1,732.4		$996.3		$1,000.6		$741.3		$712.5

IPL [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer

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	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$233.3		$248.3		$125.9		$139.3		$107.4		$109.0
Retail - commercial	171.3		172.3		111.4		114.2		59.9		58.1
Retail - industrial	214.2		225.4		118.4		128.8		95.8		96.6
Wholesale	41.0		43.1		14.6		13.9		26.4		29.2
Bulk power and other	31.4		37.2		22.0		25.9		9.4		11.3
Total Electric Utility	691.2		726.3		392.3		422.1		298.9		304.2
Gas Utility:
Retail - residential	35.2		37.7		20.0		22.8		15.2		14.9
Retail - commercial	16.1		19.3		8.8		11.8		7.3		7.5
Retail - industrial	2.0		2.6		1.6		1.4		0.4		1.2
Transportation/other	11.9		9.0		8.0		6.2		3.9		2.8
Total Gas Utility	65.2		68.6		38.4		42.2		26.8		26.4
Other Utility:
Steam	9.2		8.4		9.2		8.4		—		—
Other utility	1.7		2.3		1.3		2.1		0.4		0.2
Total Other Utility	10.9		10.7		10.5		10.5		0.4		0.2
Non-Utility and Other:
Transportation and other	22.9		10.5		—		—		—		—
Total Non-Utility and Other	22.9		10.5		—		—		—		—
Total revenues		$790.2		$816.1		$441.2		$474.8		$326.1		$330.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$508.0		$507.7		$273.4		$281.5		$234.6		$226.2
Retail - commercial	352.4		346.3		228.0		225.8		124.4		120.5
Retail - industrial	422.9		427.3		234.5		243.6		188.4		183.7
Wholesale	87.5		96.9		31.5		38.2		56.0		58.7
Bulk power and other	63.8		56.8		44.7		38.7		19.1		18.1
Total Electric Utility	1,434.6		1,435.0		812.1		827.8		622.5		607.2
Gas Utility:
Retail - residential	167.0		148.3		97.9		88.3		69.1		60.0
Retail - commercial	79.7		76.3		43.6		43.4		36.1		32.9
Retail - industrial	7.4		8.4		4.8		4.1		2.6		4.3
Transportation/other	26.9		21.2		16.7		14.5		10.2		6.7
Total Gas Utility	281.0		254.2		163.0		150.3		118.0		103.9
Other Utility:
Steam	17.6		17.8		17.6		17.8		—		—
Other utility	4.4		6.1		3.6		4.7		0.8		1.4
Total Other Utility	22.0		23.9		21.2		22.5		0.8		1.4
Non-Utility and Other:
Transportation and other	39.8		19.3		—		—		—		—
Total Non-Utility and Other	39.8		19.3		—		—		—		—
Total revenues		$1,777.4		$1,732.4		$996.3		$1,000.6		$741.3		$712.5

WPL [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer

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	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$233.3		$248.3		$125.9		$139.3		$107.4		$109.0
Retail - commercial	171.3		172.3		111.4		114.2		59.9		58.1
Retail - industrial	214.2		225.4		118.4		128.8		95.8		96.6
Wholesale	41.0		43.1		14.6		13.9		26.4		29.2
Bulk power and other	31.4		37.2		22.0		25.9		9.4		11.3
Total Electric Utility	691.2		726.3		392.3		422.1		298.9		304.2
Gas Utility:
Retail - residential	35.2		37.7		20.0		22.8		15.2		14.9
Retail - commercial	16.1		19.3		8.8		11.8		7.3		7.5
Retail - industrial	2.0		2.6		1.6		1.4		0.4		1.2
Transportation/other	11.9		9.0		8.0		6.2		3.9		2.8
Total Gas Utility	65.2		68.6		38.4		42.2		26.8		26.4
Other Utility:
Steam	9.2		8.4		9.2		8.4		—		—
Other utility	1.7		2.3		1.3		2.1		0.4		0.2
Total Other Utility	10.9		10.7		10.5		10.5		0.4		0.2
Non-Utility and Other:
Transportation and other	22.9		10.5		—		—		—		—
Total Non-Utility and Other	22.9		10.5		—		—		—		—
Total revenues		$790.2		$816.1		$441.2		$474.8		$326.1		$330.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$508.0		$507.7		$273.4		$281.5		$234.6		$226.2
Retail - commercial	352.4		346.3		228.0		225.8		124.4		120.5
Retail - industrial	422.9		427.3		234.5		243.6		188.4		183.7
Wholesale	87.5		96.9		31.5		38.2		56.0		58.7
Bulk power and other	63.8		56.8		44.7		38.7		19.1		18.1
Total Electric Utility	1,434.6		1,435.0		812.1		827.8		622.5		607.2
Gas Utility:
Retail - residential	167.0		148.3		97.9		88.3		69.1		60.0
Retail - commercial	79.7		76.3		43.6		43.4		36.1		32.9
Retail - industrial	7.4		8.4		4.8		4.1		2.6		4.3
Transportation/other	26.9		21.2		16.7		14.5		10.2		6.7
Total Gas Utility	281.0		254.2		163.0		150.3		118.0		103.9
Other Utility:
Steam	17.6		17.8		17.6		17.8		—		—
Other utility	4.4		6.1		3.6		4.7		0.8		1.4
Total Other Utility	22.0		23.9		21.2		22.5		0.8		1.4
Non-Utility and Other:
Transportation and other	39.8		19.3		—		—		—		—
Total Non-Utility and Other	39.8		19.3		—		—		—		—
Total revenues		$1,777.4		$1,732.4		$996.3		$1,000.6		$741.3		$712.5