Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of March 31, 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	4,420	2020	185,883	2020-2027	5,187	2020-2021	4,410	2020-2021
IPL	2,108	2020	106,525	2020-2027	2,223	2020-2021	—	—
WPL	2,312	2020	79,358	2020-2027	2,964	2020-2021	4,410	2020-2021

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
	March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019
Current derivative assets		$10.1		$15.8		$8.3		$12.1		$1.8		$3.7
Non-current derivative assets	8.6		11.0		8.2		10.2		0.4		0.8
Current derivative liabilities	29.9		19.0		12.7		8.9		17.2		10.1
Non-current derivative liabilities	21.2		18.6		9.7		8.5		11.5		10.1

IPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of March 31, 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	4,420	2020	185,883	2020-2027	5,187	2020-2021	4,410	2020-2021
IPL	2,108	2020	106,525	2020-2027	2,223	2020-2021	—	—
WPL	2,312	2020	79,358	2020-2027	2,964	2020-2021	4,410	2020-2021

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
	March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019
Current derivative assets		$10.1		$15.8		$8.3		$12.1		$1.8		$3.7
Non-current derivative assets	8.6		11.0		8.2		10.2		0.4		0.8
Current derivative liabilities	29.9		19.0		12.7		8.9		17.2		10.1
Non-current derivative liabilities	21.2		18.6		9.7		8.5		11.5		10.1

WPL [Member]

Derivative Instruments [Line Items]

Notional Amounts Of Derivative Instruments

As of March 31, 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	4,420	2020	185,883	2020-2027	5,187	2020-2021	4,410	2020-2021
IPL	2,108	2020	106,525	2020-2027	2,223	2020-2021	—	—
WPL	2,312	2020	79,358	2020-2027	2,964	2020-2021	4,410	2020-2021

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
	March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019		March 31, 2020		December 31, 2019
Current derivative assets		$10.1		$15.8		$8.3		$12.1		$1.8		$3.7
Non-current derivative assets	8.6		11.0		8.2		10.2		0.4		0.8
Current derivative liabilities	29.9		19.0		12.7		8.9		17.2		10.1
Non-current derivative liabilities	21.2		18.6		9.7		8.5		11.5		10.1