Revenues Revenues (Tables)

6 Months Ended

Jun. 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 June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$248.3		$229.3		$139.3		$122.4		$109.0		$106.9
Retail - commercial	172.3		165.7		114.2		103.6		58.1		62.1
Retail - industrial	225.4		207.8		128.8		109.5		96.6		98.3
Wholesale	43.1		59.4		13.9		23.3		29.2		36.1
Bulk power and other	37.2		18.7		25.9		13.6		11.3		5.1
Total Electric Utility	726.3		680.9		422.1		372.4		304.2		308.5
Gas Utility:
Retail - residential	37.7		33.7		22.8		18.8		14.9		14.9
Retail - commercial	19.3		18.7		11.8		10.8		7.5		7.9
Retail - industrial	2.6		2.6		1.4		1.8		1.2		0.8
Transportation/other	9.0		7.6		6.2		5.3		2.8		2.3
Total Gas Utility	68.6		62.6		42.2		36.7		26.4		25.9
Other Utility:
Steam	8.4		8.4		8.4		8.4		—		—
Other utility	2.3		3.1		2.1		2.7		0.2		0.4
Total Other Utility	10.7		11.5		10.5		11.1		0.2		0.4
Non-Utility and Other:
Transportation and other	10.5		10.3		—		—		—		—
Total Non-Utility and Other	10.5		10.3		—		—		—		—
Total revenues		$816.1		$765.3		$474.8		$420.2		$330.8		$334.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$507.7		$470.5		$281.5		$245.7		$226.2		$224.8
Retail - commercial	346.3		331.4		225.8		203.1		120.5		128.3
Retail - industrial	427.3		402.8		243.6		213.4		183.7		189.4
Wholesale	96.9		122.8		38.2		44.6		58.7		78.2
Bulk power and other	56.8		31.0		38.7		21.8		18.1		9.2
Total Electric Utility	1,435.0		1,358.5		827.8		728.6		607.2		629.9
Gas Utility:
Retail - residential	148.3		123.6		88.3		66.7		60.0		56.9
Retail - commercial	76.3		68.5		43.4		36.6		32.9		31.9
Retail - industrial	8.4		7.4		4.1		4.6		4.3		2.8
Transportation/other	21.2		17.4		14.5		11.9		6.7		5.5
Total Gas Utility	254.2		216.9		150.3		119.8		103.9		97.1
Other Utility:
Steam	17.8		17.0		17.8		17.0		—		—
Other utility	6.1		6.2		4.7		5.3		1.4		0.9
Total Other Utility	23.9		23.2		22.5		22.3		1.4		0.9
Non-Utility and Other:
Transportation and other	19.3		20.6		—		—		—		—
Total Non-Utility and Other	19.3		20.6		—		—		—		—
Total revenues		$1,732.4		$1,619.2		$1,000.6		$870.7		$712.5		$727.9

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 June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$248.3		$229.3		$139.3		$122.4		$109.0		$106.9
Retail - commercial	172.3		165.7		114.2		103.6		58.1		62.1
Retail - industrial	225.4		207.8		128.8		109.5		96.6		98.3
Wholesale	43.1		59.4		13.9		23.3		29.2		36.1
Bulk power and other	37.2		18.7		25.9		13.6		11.3		5.1
Total Electric Utility	726.3		680.9		422.1		372.4		304.2		308.5
Gas Utility:
Retail - residential	37.7		33.7		22.8		18.8		14.9		14.9
Retail - commercial	19.3		18.7		11.8		10.8		7.5		7.9
Retail - industrial	2.6		2.6		1.4		1.8		1.2		0.8
Transportation/other	9.0		7.6		6.2		5.3		2.8		2.3
Total Gas Utility	68.6		62.6		42.2		36.7		26.4		25.9
Other Utility:
Steam	8.4		8.4		8.4		8.4		—		—
Other utility	2.3		3.1		2.1		2.7		0.2		0.4
Total Other Utility	10.7		11.5		10.5		11.1		0.2		0.4
Non-Utility and Other:
Transportation and other	10.5		10.3		—		—		—		—
Total Non-Utility and Other	10.5		10.3		—		—		—		—
Total revenues		$816.1		$765.3		$474.8		$420.2		$330.8		$334.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$507.7		$470.5		$281.5		$245.7		$226.2		$224.8
Retail - commercial	346.3		331.4		225.8		203.1		120.5		128.3
Retail - industrial	427.3		402.8		243.6		213.4		183.7		189.4
Wholesale	96.9		122.8		38.2		44.6		58.7		78.2
Bulk power and other	56.8		31.0		38.7		21.8		18.1		9.2
Total Electric Utility	1,435.0		1,358.5		827.8		728.6		607.2		629.9
Gas Utility:
Retail - residential	148.3		123.6		88.3		66.7		60.0		56.9
Retail - commercial	76.3		68.5		43.4		36.6		32.9		31.9
Retail - industrial	8.4		7.4		4.1		4.6		4.3		2.8
Transportation/other	21.2		17.4		14.5		11.9		6.7		5.5
Total Gas Utility	254.2		216.9		150.3		119.8		103.9		97.1
Other Utility:
Steam	17.8		17.0		17.8		17.0		—		—
Other utility	6.1		6.2		4.7		5.3		1.4		0.9
Total Other Utility	23.9		23.2		22.5		22.3		1.4		0.9
Non-Utility and Other:
Transportation and other	19.3		20.6		—		—		—		—
Total Non-Utility and Other	19.3		20.6		—		—		—		—
Total revenues		$1,732.4		$1,619.2		$1,000.6		$870.7		$712.5		$727.9

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 June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$248.3		$229.3		$139.3		$122.4		$109.0		$106.9
Retail - commercial	172.3		165.7		114.2		103.6		58.1		62.1
Retail - industrial	225.4		207.8		128.8		109.5		96.6		98.3
Wholesale	43.1		59.4		13.9		23.3		29.2		36.1
Bulk power and other	37.2		18.7		25.9		13.6		11.3		5.1
Total Electric Utility	726.3		680.9		422.1		372.4		304.2		308.5
Gas Utility:
Retail - residential	37.7		33.7		22.8		18.8		14.9		14.9
Retail - commercial	19.3		18.7		11.8		10.8		7.5		7.9
Retail - industrial	2.6		2.6		1.4		1.8		1.2		0.8
Transportation/other	9.0		7.6		6.2		5.3		2.8		2.3
Total Gas Utility	68.6		62.6		42.2		36.7		26.4		25.9
Other Utility:
Steam	8.4		8.4		8.4		8.4		—		—
Other utility	2.3		3.1		2.1		2.7		0.2		0.4
Total Other Utility	10.7		11.5		10.5		11.1		0.2		0.4
Non-Utility and Other:
Transportation and other	10.5		10.3		—		—		—		—
Total Non-Utility and Other	10.5		10.3		—		—		—		—
Total revenues		$816.1		$765.3		$474.8		$420.2		$330.8		$334.8

	Alliant Energy				IPL				WPL
Six Months Ended June 30	2018		2017		2018		2017		2018		2017
Electric Utility:
Retail - residential		$507.7		$470.5		$281.5		$245.7		$226.2		$224.8
Retail - commercial	346.3		331.4		225.8		203.1		120.5		128.3
Retail - industrial	427.3		402.8		243.6		213.4		183.7		189.4
Wholesale	96.9		122.8		38.2		44.6		58.7		78.2
Bulk power and other	56.8		31.0		38.7		21.8		18.1		9.2
Total Electric Utility	1,435.0		1,358.5		827.8		728.6		607.2		629.9
Gas Utility:
Retail - residential	148.3		123.6		88.3		66.7		60.0		56.9
Retail - commercial	76.3		68.5		43.4		36.6		32.9		31.9
Retail - industrial	8.4		7.4		4.1		4.6		4.3		2.8
Transportation/other	21.2		17.4		14.5		11.9		6.7		5.5
Total Gas Utility	254.2		216.9		150.3		119.8		103.9		97.1
Other Utility:
Steam	17.8		17.0		17.8		17.0		—		—
Other utility	6.1		6.2		4.7		5.3		1.4		0.9
Total Other Utility	23.9		23.2		22.5		22.3		1.4		0.9
Non-Utility and Other:
Transportation and other	19.3		20.6		—		—		—		—
Total Non-Utility and Other	19.3		20.6		—		—		—		—
Total revenues		$1,732.4		$1,619.2		$1,000.6		$870.7		$712.5		$727.9