Property, Plant and Equipment (Narrative) (Details)	9 Months Ended
	Sep. 30, 2022 MW
Edgewater Generating Station | WPL [Member]
Property, Plant and Equipment [Line Items]
Nameplate capacity (in MW)	414
Columbia Energy Center | WPL [Member]
Property, Plant and Equipment [Line Items]
Nameplate capacity (in MW)	595
Lansing Generating Station | IPL [Member]
Property, Plant and Equipment [Line Items]
Nameplate capacity (in MW)	275