Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) - IPL [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Receivables [Line Items]
Collections	$ 592.2	$ 549.5	$ 1,635.7	$ 1,550.2
Write-offs, net of recoveries	$ 3.2	$ 4.9	$ 11.3	$ 12.9