Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2019, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	18,141	2019-2020	184,007	2019-2026	7,620	2019-2021	5,796	2019-2021
IPL	8,630	2019-2020	101,579	2019-2026	3,311	2019-2021	—	—
WPL	9,511	2019-2020	82,428	2019-2026	4,309	2019-2021	5,796	2019-2021

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy				IPL				WPL
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Current derivative assets		$18.6		$24.6		$12.8		$16.1		$5.8		$8.5
Non-current derivative assets	11.7		3.7		10.5		1.6		1.2		2.1
Current derivative liabilities	13.4		5.6		5.6		3.1		7.8		2.5
Non-current derivative liabilities	18.4		17.7		7.8		8.1		10.6		9.6

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2019, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	18,141	2019-2020	184,007	2019-2026	7,620	2019-2021	5,796	2019-2021
IPL	8,630	2019-2020	101,579	2019-2026	3,311	2019-2021	—	—
WPL	9,511	2019-2020	82,428	2019-2026	4,309	2019-2021	5,796	2019-2021

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy				IPL				WPL
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Current derivative assets		$18.6		$24.6		$12.8		$16.1		$5.8		$8.5
Non-current derivative assets	11.7		3.7		10.5		1.6		1.2		2.1
Current derivative liabilities	13.4		5.6		5.6		3.1		7.8		2.5
Non-current derivative liabilities	18.4		17.7		7.8		8.1		10.6		9.6

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of September 30, 2019, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):

	FTRs		Natural Gas		Coal		Diesel Fuel
	MWhs	Years	Dths	Years	Tons	Years	Gallons	Years
Alliant Energy	18,141	2019-2020	184,007	2019-2026	7,620	2019-2021	5,796	2019-2021
IPL	8,630	2019-2020	101,579	2019-2026	3,311	2019-2021	—	—
WPL	9,511	2019-2020	82,428	2019-2026	4,309	2019-2021	5,796	2019-2021

Fair Value Of Financial Instruments

Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):

	Alliant Energy				IPL				WPL
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Current derivative assets		$18.6		$24.6		$12.8		$16.1		$5.8		$8.5
Non-current derivative assets	11.7		3.7		10.5		1.6		1.2		2.1
Current derivative liabilities	13.4		5.6		5.6		3.1		7.8		2.5
Non-current derivative liabilities	18.4		17.7		7.8		8.1		10.6		9.6