Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2020, 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	21,455	2020-2021	234,304	2020-2028	4,482	2020-2021	6,804	2020-2022
IPL	8,978	2020-2021	123,308	2020-2028	1,834	2020-2021	—	—
WPL	12,477	2020-2021	110,996	2020-2027	2,648	2020-2021	6,804	2020-2022

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, 2020		December 31, 2019		June 30, 2020		December 31, 2019		June 30, 2020		December 31, 2019
Current derivative assets		$27.9		$15.8		$22.5		$12.1		$5.4		$3.7
Non-current derivative assets	14.5		11.0		14.5		10.2		—		0.8
Current derivative liabilities	20.0		19.0		8.5		8.9		11.5		10.1
Non-current derivative liabilities	26.2		18.6		11.8		8.5		14.4		10.1

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2020, 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	21,455	2020-2021	234,304	2020-2028	4,482	2020-2021	6,804	2020-2022
IPL	8,978	2020-2021	123,308	2020-2028	1,834	2020-2021	—	—
WPL	12,477	2020-2021	110,996	2020-2027	2,648	2020-2021	6,804	2020-2022

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, 2020		December 31, 2019		June 30, 2020		December 31, 2019		June 30, 2020		December 31, 2019
Current derivative assets		$27.9		$15.8		$22.5		$12.1		$5.4		$3.7
Non-current derivative assets	14.5		11.0		14.5		10.2		—		0.8
Current derivative liabilities	20.0		19.0		8.5		8.9		11.5		10.1
Non-current derivative liabilities	26.2		18.6		11.8		8.5		14.4		10.1

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of June 30, 2020, 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	21,455	2020-2021	234,304	2020-2028	4,482	2020-2021	6,804	2020-2022
IPL	8,978	2020-2021	123,308	2020-2028	1,834	2020-2021	—	—
WPL	12,477	2020-2021	110,996	2020-2027	2,648	2020-2021	6,804	2020-2022

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, 2020		December 31, 2019		June 30, 2020		December 31, 2019		June 30, 2020		December 31, 2019
Current derivative assets		$27.9		$15.8		$22.5		$12.1		$5.4		$3.7
Non-current derivative assets	14.5		11.0		14.5		10.2		—		0.8
Current derivative liabilities	20.0		19.0		8.5		8.9		11.5		10.1
Non-current derivative liabilities	26.2		18.6		11.8		8.5		14.4		10.1