Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) - IPL [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Receivables [Line Items]
Collections	$ 487.7	$ 483.7	$ 1,043.5	$ 1,000.7
Write-offs, net of recoveries	$ 2.6	$ 1.9	$ 8.1	$ 8.0