Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) - IPL [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable [Line Items]
Collections	$ 2,192.8	$ 2,076.7	$ 1,647.1
Write-offs, net of recoveries	$ 19.2	$ 21.3	$ 17.7