Revenues Revenues (Tables)

9 Months Ended

Sep. 30, 2018

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	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$312.9		$296.4		$180.1		$168.5		$132.8		$127.9
Retail - commercial	215.4		205.9		146.0		137.5		69.4		68.4
Retail - industrial	247.8		243.4		141.4		137.3		106.4		106.1
Wholesale	50.0		63.5		18.2		26.7		31.8		36.8
Bulk power and other	35.1		31.4		23.5		19.0		11.6		12.4
Total Electric Utility	861.2		840.6		509.2		489.0		352.0		351.6
Gas Utility:
Retail - residential	21.8		21.5		12.6		12.0		9.2		9.5
Retail - commercial	11.0		12.9		6.4		7.8		4.6		5.1
Retail - industrial	3.0		3.0		2.0		2.2		1.0		0.8
Transportation/other	9.0		8.4		5.7		5.4		3.3		3.0
Total Gas Utility	44.8		45.8		26.7		27.4		18.1		18.4
Other Utility:
Steam	8.7		8.3		8.7		8.3		—		—
Other utility	3.6		2.9		3.0		2.7		0.6		0.2
Total Other Utility	12.3		11.2		11.7		11.0		0.6		0.2
Non-Utility and Other:
Transportation and other	10.3		9.3		—		—		—		—
Total Non-Utility and Other	10.3		9.3		—		—		—		—
Total revenues		$928.6		$906.9		$547.6		$527.4		$370.7		$370.2

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$820.6		$766.9		$461.6		$414.2		$359.0		$352.7
Retail - commercial	561.7		537.3		371.8		340.6		189.9		196.7
Retail - industrial	675.1		646.2		385.0		350.7		290.1		295.5
Wholesale	146.9		186.3		56.4		71.3		90.5		115.0
Bulk power and other	91.9		62.4		62.2		40.8		29.7		21.6
Total Electric Utility	2,296.2		2,199.1		1,337.0		1,217.6		959.2		981.5
Gas Utility:
Retail - residential	170.1		145.1		100.9		78.7		69.2		66.4
Retail - commercial	87.3		81.4		49.8		44.4		37.5		37.0
Retail - industrial	11.4		10.4		6.1		6.8		5.3		3.6
Transportation/other	30.2		25.8		20.2		17.3		10.0		8.5
Total Gas Utility	299.0		262.7		177.0		147.2		122.0		115.5
Other Utility:
Steam	26.5		25.3		26.5		25.3		—		—
Other utility	9.7		9.1		7.7		8.0		2.0		1.1
Total Other Utility	36.2		34.4		34.2		33.3		2.0		1.1
Non-Utility and Other:
Transportation and other	29.6		29.9		—		—		—		—
Total Non-Utility and Other	29.6		29.9		—		—		—		—
Total revenues		$2,661.0		$2,526.1		$1,548.2		$1,398.1		$1,083.2		$1,098.1

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	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$312.9		$296.4		$180.1		$168.5		$132.8		$127.9
Retail - commercial	215.4		205.9		146.0		137.5		69.4		68.4
Retail - industrial	247.8		243.4		141.4		137.3		106.4		106.1
Wholesale	50.0		63.5		18.2		26.7		31.8		36.8
Bulk power and other	35.1		31.4		23.5		19.0		11.6		12.4
Total Electric Utility	861.2		840.6		509.2		489.0		352.0		351.6
Gas Utility:
Retail - residential	21.8		21.5		12.6		12.0		9.2		9.5
Retail - commercial	11.0		12.9		6.4		7.8		4.6		5.1
Retail - industrial	3.0		3.0		2.0		2.2		1.0		0.8
Transportation/other	9.0		8.4		5.7		5.4		3.3		3.0
Total Gas Utility	44.8		45.8		26.7		27.4		18.1		18.4
Other Utility:
Steam	8.7		8.3		8.7		8.3		—		—
Other utility	3.6		2.9		3.0		2.7		0.6		0.2
Total Other Utility	12.3		11.2		11.7		11.0		0.6		0.2
Non-Utility and Other:
Transportation and other	10.3		9.3		—		—		—		—
Total Non-Utility and Other	10.3		9.3		—		—		—		—
Total revenues		$928.6		$906.9		$547.6		$527.4		$370.7		$370.2

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$820.6		$766.9		$461.6		$414.2		$359.0		$352.7
Retail - commercial	561.7		537.3		371.8		340.6		189.9		196.7
Retail - industrial	675.1		646.2		385.0		350.7		290.1		295.5
Wholesale	146.9		186.3		56.4		71.3		90.5		115.0
Bulk power and other	91.9		62.4		62.2		40.8		29.7		21.6
Total Electric Utility	2,296.2		2,199.1		1,337.0		1,217.6		959.2		981.5
Gas Utility:
Retail - residential	170.1		145.1		100.9		78.7		69.2		66.4
Retail - commercial	87.3		81.4		49.8		44.4		37.5		37.0
Retail - industrial	11.4		10.4		6.1		6.8		5.3		3.6
Transportation/other	30.2		25.8		20.2		17.3		10.0		8.5
Total Gas Utility	299.0		262.7		177.0		147.2		122.0		115.5
Other Utility:
Steam	26.5		25.3		26.5		25.3		—		—
Other utility	9.7		9.1		7.7		8.0		2.0		1.1
Total Other Utility	36.2		34.4		34.2		33.3		2.0		1.1
Non-Utility and Other:
Transportation and other	29.6		29.9		—		—		—		—
Total Non-Utility and Other	29.6		29.9		—		—		—		—
Total revenues		$2,661.0		$2,526.1		$1,548.2		$1,398.1		$1,083.2		$1,098.1

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	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$312.9		$296.4		$180.1		$168.5		$132.8		$127.9
Retail - commercial	215.4		205.9		146.0		137.5		69.4		68.4
Retail - industrial	247.8		243.4		141.4		137.3		106.4		106.1
Wholesale	50.0		63.5		18.2		26.7		31.8		36.8
Bulk power and other	35.1		31.4		23.5		19.0		11.6		12.4
Total Electric Utility	861.2		840.6		509.2		489.0		352.0		351.6
Gas Utility:
Retail - residential	21.8		21.5		12.6		12.0		9.2		9.5
Retail - commercial	11.0		12.9		6.4		7.8		4.6		5.1
Retail - industrial	3.0		3.0		2.0		2.2		1.0		0.8
Transportation/other	9.0		8.4		5.7		5.4		3.3		3.0
Total Gas Utility	44.8		45.8		26.7		27.4		18.1		18.4
Other Utility:
Steam	8.7		8.3		8.7		8.3		—		—
Other utility	3.6		2.9		3.0		2.7		0.6		0.2
Total Other Utility	12.3		11.2		11.7		11.0		0.6		0.2
Non-Utility and Other:
Transportation and other	10.3		9.3		—		—		—		—
Total Non-Utility and Other	10.3		9.3		—		—		—		—
Total revenues		$928.6		$906.9		$547.6		$527.4		$370.7		$370.2

	Alliant Energy				IPL				WPL
Nine Months Ended September 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$820.6		$766.9		$461.6		$414.2		$359.0		$352.7
Retail - commercial	561.7		537.3		371.8		340.6		189.9		196.7
Retail - industrial	675.1		646.2		385.0		350.7		290.1		295.5
Wholesale	146.9		186.3		56.4		71.3		90.5		115.0
Bulk power and other	91.9		62.4		62.2		40.8		29.7		21.6
Total Electric Utility	2,296.2		2,199.1		1,337.0		1,217.6		959.2		981.5
Gas Utility:
Retail - residential	170.1		145.1		100.9		78.7		69.2		66.4
Retail - commercial	87.3		81.4		49.8		44.4		37.5		37.0
Retail - industrial	11.4		10.4		6.1		6.8		5.3		3.6
Transportation/other	30.2		25.8		20.2		17.3		10.0		8.5
Total Gas Utility	299.0		262.7		177.0		147.2		122.0		115.5
Other Utility:
Steam	26.5		25.3		26.5		25.3		—		—
Other utility	9.7		9.1		7.7		8.0		2.0		1.1
Total Other Utility	36.2		34.4		34.2		33.3		2.0		1.1
Non-Utility and Other:
Transportation and other	29.6		29.9		—		—		—		—
Total Non-Utility and Other	29.6		29.9		—		—		—		—
Total revenues		$2,661.0		$2,526.1		$1,548.2		$1,398.1		$1,083.2		$1,098.1