Valuation And Qualifying Accounts and Reserves (Details) - Accumulated Provision for Uncollectible Accounts [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 11.0	$ 18.0	$ 7.0
Charged to Expense	17.0	12.0	25.0
Charged to Other Accounts	0.0	0.0	9.0
Deductions	21.0	19.0	23.0
Ending Balance	7.0	11.0	18.0
IPL [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	1.0	1.0	1.0
Charged to Expense	7.0	6.0	18.0
Charged to Other Accounts	0.0	0.0	0.0
Deductions	8.0	6.0	18.0
Ending Balance	0.0	1.0	1.0
WPL [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	10.0	17.0	6.0
Charged to Expense	10.0	6.0	7.0
Charged to Other Accounts	0.0	0.0	9.0
Deductions	13.0	13.0	5.0
Ending Balance	$ 7.0	$ 10.0	$ 17.0