Revenues

3 Months Ended

Mar. 31, 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 March 31	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$274.7		$259.4		$147.5		$142.2		$127.2		$117.2
Retail - commercial	181.1		174.0		116.6		111.6		64.5		62.4
Retail - industrial	208.7		201.9		116.1		114.8		92.6		87.1
Wholesale	46.5		53.8		16.9		24.3		29.6		29.5
Bulk power and other	32.4		19.6		22.7		12.8		9.7		6.8
Total Electric Utility	743.4		708.7		419.8		405.7		323.6		303.0
Gas Utility:
Retail - residential	131.8		110.6		77.9		65.5		53.9		45.1
Retail - commercial	63.6		57.0		34.8		31.6		28.8		25.4
Retail - industrial	5.4		5.8		3.2		2.7		2.2		3.1
Transportation/other	15.0		12.2		8.7		8.3		6.3		3.9
Total Gas Utility	215.8		185.6		124.6		108.1		91.2		77.5
Other Utility:
Steam	8.4		9.4		8.4		9.4		—		—
Other utility	2.7		3.8		2.3		2.6		0.4		1.2
Total Other Utility	11.1		13.2		10.7		12.0		0.4		1.2
Non-Utility and Other:
Transportation and other	16.9		8.8		—		—		—		—
Total Non-Utility and Other	16.9		8.8		—		—		—		—
Total revenues		$987.2		$916.3		$555.1		$525.8		$415.2		$381.7

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 March 31	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$274.7		$259.4		$147.5		$142.2		$127.2		$117.2
Retail - commercial	181.1		174.0		116.6		111.6		64.5		62.4
Retail - industrial	208.7		201.9		116.1		114.8		92.6		87.1
Wholesale	46.5		53.8		16.9		24.3		29.6		29.5
Bulk power and other	32.4		19.6		22.7		12.8		9.7		6.8
Total Electric Utility	743.4		708.7		419.8		405.7		323.6		303.0
Gas Utility:
Retail - residential	131.8		110.6		77.9		65.5		53.9		45.1
Retail - commercial	63.6		57.0		34.8		31.6		28.8		25.4
Retail - industrial	5.4		5.8		3.2		2.7		2.2		3.1
Transportation/other	15.0		12.2		8.7		8.3		6.3		3.9
Total Gas Utility	215.8		185.6		124.6		108.1		91.2		77.5
Other Utility:
Steam	8.4		9.4		8.4		9.4		—		—
Other utility	2.7		3.8		2.3		2.6		0.4		1.2
Total Other Utility	11.1		13.2		10.7		12.0		0.4		1.2
Non-Utility and Other:
Transportation and other	16.9		8.8		—		—		—		—
Total Non-Utility and Other	16.9		8.8		—		—		—		—
Total revenues		$987.2		$916.3		$555.1		$525.8		$415.2		$381.7

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 March 31	2019		2018		2019		2018		2019		2018
Electric Utility:
Retail - residential		$274.7		$259.4		$147.5		$142.2		$127.2		$117.2
Retail - commercial	181.1		174.0		116.6		111.6		64.5		62.4
Retail - industrial	208.7		201.9		116.1		114.8		92.6		87.1
Wholesale	46.5		53.8		16.9		24.3		29.6		29.5
Bulk power and other	32.4		19.6		22.7		12.8		9.7		6.8
Total Electric Utility	743.4		708.7		419.8		405.7		323.6		303.0
Gas Utility:
Retail - residential	131.8		110.6		77.9		65.5		53.9		45.1
Retail - commercial	63.6		57.0		34.8		31.6		28.8		25.4
Retail - industrial	5.4		5.8		3.2		2.7		2.2		3.1
Transportation/other	15.0		12.2		8.7		8.3		6.3		3.9
Total Gas Utility	215.8		185.6		124.6		108.1		91.2		77.5
Other Utility:
Steam	8.4		9.4		8.4		9.4		—		—
Other utility	2.7		3.8		2.3		2.6		0.4		1.2
Total Other Utility	11.1		13.2		10.7		12.0		0.4		1.2
Non-Utility and Other:
Transportation and other	16.9		8.8		—		—		—		—
Total Non-Utility and Other	16.9		8.8		—		—		—		—
Total revenues		$987.2		$916.3		$555.1		$525.8		$415.2		$381.7