Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) - IPL [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Receivables [Line Items]
Collections reinvested in receivables	$ 499.7	$ 480.1	$ 1,362.1	$ 1,403.1
Write-offs (recoveries), net	$ (0.3)	$ 3.3	$ (0.6)	$ 6.8