Revenues (Tables)

9 Months Ended

Sep. 30, 2019

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

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 September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$331.6		$312.9		$196.0		$180.1		$135.6		$132.8
Retail - commercial	230.9		215.4		158.4		146.0		72.5		69.4
Retail - industrial	263.4		247.8		157.5		141.4		105.9		106.4
Wholesale	49.8		50.0		17.7		18.2		32.1		31.8
Bulk power and other	40.2		35.1		31.3		23.5		8.9		11.6
Total Electric Utility	915.9		861.2		560.9		509.2		355.0		352.0
Gas Utility:
Retail - residential	20.4		21.8		11.7		12.6		8.7		9.2
Retail - commercial	10.0		11.0		5.9		6.4		4.1		4.6
Retail - industrial	2.3		3.0		1.9		2.0		0.4		1.0
Transportation/other	8.8		9.0		5.3		5.7		3.5		3.3
Total Gas Utility	41.5		44.8		24.8		26.7		16.7		18.1
Other Utility:
Steam	9.1		8.7		9.1		8.7		—		—
Other utility	2.1		3.6		1.7		3.0		0.4		0.6
Total Other Utility	11.2		12.3		10.8		11.7		0.4		0.6
Non-Utility and Other:
Transportation and other	21.6		10.3		—		—		—		—
Total Non-Utility and Other	21.6		10.3		—		—		—		—
Total revenues		$990.2		$928.6		$596.5		$547.6		$372.1		$370.7

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$839.6		$820.6		$469.4		$461.6		$370.2		$359.0
Retail - commercial	583.3		561.7		386.4		371.8		196.9		189.9
Retail - industrial	686.3		675.1		392.0		385.0		294.3		290.1
Wholesale	137.3		146.9		49.2		56.4		88.1		90.5
Bulk power and other	104.0		91.9		76.0		62.2		28.0		29.7
Total Electric Utility	2,350.5		2,296.2		1,373.0		1,337.0		977.5		959.2
Gas Utility:
Retail - residential	187.4		170.1		109.6		100.9		77.8		69.2
Retail - commercial	89.7		87.3		49.5		49.8		40.2		37.5
Retail - industrial	9.7		11.4		6.7		6.1		3.0		5.3
Transportation/other	35.7		30.2		22.0		20.2		13.7		10.0
Total Gas Utility	322.5		299.0		187.8		177.0		134.7		122.0
Other Utility:
Steam	26.7		26.5		26.7		26.5		—		—
Other utility	6.5		9.7		5.3		7.7		1.2		2.0
Total Other Utility	33.2		36.2		32.0		34.2		1.2		2.0
Non-Utility and Other:
Transportation and other	61.4		29.6		—		—		—		—
Total Non-Utility and Other	61.4		29.6		—		—		—		—
Total revenues		$2,767.6		$2,661.0		$1,592.8		$1,548.2		$1,113.4		$1,083.2

IPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

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 September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$331.6		$312.9		$196.0		$180.1		$135.6		$132.8
Retail - commercial	230.9		215.4		158.4		146.0		72.5		69.4
Retail - industrial	263.4		247.8		157.5		141.4		105.9		106.4
Wholesale	49.8		50.0		17.7		18.2		32.1		31.8
Bulk power and other	40.2		35.1		31.3		23.5		8.9		11.6
Total Electric Utility	915.9		861.2		560.9		509.2		355.0		352.0
Gas Utility:
Retail - residential	20.4		21.8		11.7		12.6		8.7		9.2
Retail - commercial	10.0		11.0		5.9		6.4		4.1		4.6
Retail - industrial	2.3		3.0		1.9		2.0		0.4		1.0
Transportation/other	8.8		9.0		5.3		5.7		3.5		3.3
Total Gas Utility	41.5		44.8		24.8		26.7		16.7		18.1
Other Utility:
Steam	9.1		8.7		9.1		8.7		—		—
Other utility	2.1		3.6		1.7		3.0		0.4		0.6
Total Other Utility	11.2		12.3		10.8		11.7		0.4		0.6
Non-Utility and Other:
Transportation and other	21.6		10.3		—		—		—		—
Total Non-Utility and Other	21.6		10.3		—		—		—		—
Total revenues		$990.2		$928.6		$596.5		$547.6		$372.1		$370.7

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$839.6		$820.6		$469.4		$461.6		$370.2		$359.0
Retail - commercial	583.3		561.7		386.4		371.8		196.9		189.9
Retail - industrial	686.3		675.1		392.0		385.0		294.3		290.1
Wholesale	137.3		146.9		49.2		56.4		88.1		90.5
Bulk power and other	104.0		91.9		76.0		62.2		28.0		29.7
Total Electric Utility	2,350.5		2,296.2		1,373.0		1,337.0		977.5		959.2
Gas Utility:
Retail - residential	187.4		170.1		109.6		100.9		77.8		69.2
Retail - commercial	89.7		87.3		49.5		49.8		40.2		37.5
Retail - industrial	9.7		11.4		6.7		6.1		3.0		5.3
Transportation/other	35.7		30.2		22.0		20.2		13.7		10.0
Total Gas Utility	322.5		299.0		187.8		177.0		134.7		122.0
Other Utility:
Steam	26.7		26.5		26.7		26.5		—		—
Other utility	6.5		9.7		5.3		7.7		1.2		2.0
Total Other Utility	33.2		36.2		32.0		34.2		1.2		2.0
Non-Utility and Other:
Transportation and other	61.4		29.6		—		—		—		—
Total Non-Utility and Other	61.4		29.6		—		—		—		—
Total revenues		$2,767.6		$2,661.0		$1,592.8		$1,548.2		$1,113.4		$1,083.2

WPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue

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 September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$331.6		$312.9		$196.0		$180.1		$135.6		$132.8
Retail - commercial	230.9		215.4		158.4		146.0		72.5		69.4
Retail - industrial	263.4		247.8		157.5		141.4		105.9		106.4
Wholesale	49.8		50.0		17.7		18.2		32.1		31.8
Bulk power and other	40.2		35.1		31.3		23.5		8.9		11.6
Total Electric Utility	915.9		861.2		560.9		509.2		355.0		352.0
Gas Utility:
Retail - residential	20.4		21.8		11.7		12.6		8.7		9.2
Retail - commercial	10.0		11.0		5.9		6.4		4.1		4.6
Retail - industrial	2.3		3.0		1.9		2.0		0.4		1.0
Transportation/other	8.8		9.0		5.3		5.7		3.5		3.3
Total Gas Utility	41.5		44.8		24.8		26.7		16.7		18.1
Other Utility:
Steam	9.1		8.7		9.1		8.7		—		—
Other utility	2.1		3.6		1.7		3.0		0.4		0.6
Total Other Utility	11.2		12.3		10.8		11.7		0.4		0.6
Non-Utility and Other:
Transportation and other	21.6		10.3		—		—		—		—
Total Non-Utility and Other	21.6		10.3		—		—		—		—
Total revenues		$990.2		$928.6		$596.5		$547.6		$372.1		$370.7

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$839.6		$820.6		$469.4		$461.6		$370.2		$359.0
Retail - commercial	583.3		561.7		386.4		371.8		196.9		189.9
Retail - industrial	686.3		675.1		392.0		385.0		294.3		290.1
Wholesale	137.3		146.9		49.2		56.4		88.1		90.5
Bulk power and other	104.0		91.9		76.0		62.2		28.0		29.7
Total Electric Utility	2,350.5		2,296.2		1,373.0		1,337.0		977.5		959.2
Gas Utility:
Retail - residential	187.4		170.1		109.6		100.9		77.8		69.2
Retail - commercial	89.7		87.3		49.5		49.8		40.2		37.5
Retail - industrial	9.7		11.4		6.7		6.1		3.0		5.3
Transportation/other	35.7		30.2		22.0		20.2		13.7		10.0
Total Gas Utility	322.5		299.0		187.8		177.0		134.7		122.0
Other Utility:
Steam	26.7		26.5		26.7		26.5		—		—
Other utility	6.5		9.7		5.3		7.7		1.2		2.0
Total Other Utility	33.2		36.2		32.0		34.2		1.2		2.0
Non-Utility and Other:
Transportation and other	61.4		29.6		—		—		—		—
Total Non-Utility and Other	61.4		29.6		—		—		—		—
Total revenues		$2,767.6		$2,661.0		$1,592.8		$1,548.2		$1,113.4		$1,083.2