Revenues Revenues (Tables)

3 Months Ended

Mar. 31, 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 March 31	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$259.4		$241.2		$142.2		$123.3		$117.2		$117.9
Retail - commercial	174.0		165.7		111.6		99.5		62.4		66.2
Retail - industrial	201.9		195.0		114.8		103.9		87.1		91.1
Wholesale	53.8		63.4		24.3		21.3		29.5		42.1
Bulk power and other	19.6		12.3		12.8		8.2		6.8		4.1
Total Electric Utility	708.7		677.6		405.7		356.2		303.0		321.4
Gas Utility:
Retail - residential	110.6		89.9		65.5		47.9		45.1		42.0
Retail - commercial	57.0		49.8		31.6		25.8		25.4		24.0
Retail - industrial	5.8		4.8		2.7		2.8		3.1		2.0
Transportation/other	12.2		9.8		8.3		6.6		3.9		3.2
Total Gas Utility	185.6		154.3		108.1		83.1		77.5		71.2
Other Utility:
Steam	9.4		8.6		9.4		8.6		—		—
Other utility	3.8		3.1		2.6		2.6		1.2		0.5
Total Other Utility	13.2		11.7		12.0		11.2		1.2		0.5
Non-Utility and Other:
Transportation and other	8.8		10.3		—		—		—		—
Total Non-Utility and Other	8.8		10.3		—		—		—		—
Total revenues		$916.3		$853.9		$525.8		$450.5		$381.7		$393.1

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 March 31	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$259.4		$241.2		$142.2		$123.3		$117.2		$117.9
Retail - commercial	174.0		165.7		111.6		99.5		62.4		66.2
Retail - industrial	201.9		195.0		114.8		103.9		87.1		91.1
Wholesale	53.8		63.4		24.3		21.3		29.5		42.1
Bulk power and other	19.6		12.3		12.8		8.2		6.8		4.1
Total Electric Utility	708.7		677.6		405.7		356.2		303.0		321.4
Gas Utility:
Retail - residential	110.6		89.9		65.5		47.9		45.1		42.0
Retail - commercial	57.0		49.8		31.6		25.8		25.4		24.0
Retail - industrial	5.8		4.8		2.7		2.8		3.1		2.0
Transportation/other	12.2		9.8		8.3		6.6		3.9		3.2
Total Gas Utility	185.6		154.3		108.1		83.1		77.5		71.2
Other Utility:
Steam	9.4		8.6		9.4		8.6		—		—
Other utility	3.8		3.1		2.6		2.6		1.2		0.5
Total Other Utility	13.2		11.7		12.0		11.2		1.2		0.5
Non-Utility and Other:
Transportation and other	8.8		10.3		—		—		—		—
Total Non-Utility and Other	8.8		10.3		—		—		—		—
Total revenues		$916.3		$853.9		$525.8		$450.5		$381.7		$393.1

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 March 31	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$259.4		$241.2		$142.2		$123.3		$117.2		$117.9
Retail - commercial	174.0		165.7		111.6		99.5		62.4		66.2
Retail - industrial	201.9		195.0		114.8		103.9		87.1		91.1
Wholesale	53.8		63.4		24.3		21.3		29.5		42.1
Bulk power and other	19.6		12.3		12.8		8.2		6.8		4.1
Total Electric Utility	708.7		677.6		405.7		356.2		303.0		321.4
Gas Utility:
Retail - residential	110.6		89.9		65.5		47.9		45.1		42.0
Retail - commercial	57.0		49.8		31.6		25.8		25.4		24.0
Retail - industrial	5.8		4.8		2.7		2.8		3.1		2.0
Transportation/other	12.2		9.8		8.3		6.6		3.9		3.2
Total Gas Utility	185.6		154.3		108.1		83.1		77.5		71.2
Other Utility:
Steam	9.4		8.6		9.4		8.6		—		—
Other utility	3.8		3.1		2.6		2.6		1.2		0.5
Total Other Utility	13.2		11.7		12.0		11.2		1.2		0.5
Non-Utility and Other:
Transportation and other	8.8		10.3		—		—		—		—
Total Non-Utility and Other	8.8		10.3		—		—		—		—
Total revenues		$916.3		$853.9		$525.8		$450.5		$381.7		$393.1