Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 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	24,229	2019-2020	163,808	2019-2026	8,027	2019-2021	6,552	2019-2021
IPL	11,721	2019-2020	75,276	2019-2026	3,587	2019-2021	—	—
WPL	12,508	2019-2020	88,532	2019-2026	4,440	2019-2021	6,552	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
	June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018
Current derivative assets		$18.4		$24.6		$12.0		$16.1		$6.4		$8.5
Non-current derivative assets	3.5		3.7		1.9		1.6		1.6		2.1
Current derivative liabilities	12.9		5.6		5.8		3.1		7.1		2.5
Non-current derivative liabilities	15.1		17.7		6.4		8.1		8.7		9.6

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 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	24,229	2019-2020	163,808	2019-2026	8,027	2019-2021	6,552	2019-2021
IPL	11,721	2019-2020	75,276	2019-2026	3,587	2019-2021	—	—
WPL	12,508	2019-2020	88,532	2019-2026	4,440	2019-2021	6,552	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
	June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018
Current derivative assets		$18.4		$24.6		$12.0		$16.1		$6.4		$8.5
Non-current derivative assets	3.5		3.7		1.9		1.6		1.6		2.1
Current derivative liabilities	12.9		5.6		5.8		3.1		7.1		2.5
Non-current derivative liabilities	15.1		17.7		6.4		8.1		8.7		9.6

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 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	24,229	2019-2020	163,808	2019-2026	8,027	2019-2021	6,552	2019-2021
IPL	11,721	2019-2020	75,276	2019-2026	3,587	2019-2021	—	—
WPL	12,508	2019-2020	88,532	2019-2026	4,440	2019-2021	6,552	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
	June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018		June 30, 2019		December 31, 2018
Current derivative assets		$18.4		$24.6		$12.0		$16.1		$6.4		$8.5
Non-current derivative assets	3.5		3.7		1.9		1.6		1.6		2.1
Current derivative liabilities	12.9		5.6		5.8		3.1		7.1		2.5
Non-current derivative liabilities	15.1		17.7		6.4		8.1		8.7		9.6