Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) - IPL [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Receivables [Line Items]
Collections reinvested in receivables	$ 417.1	$ 475.8	$ 923.0	$ 1,017.2
Credit losses, net of recoveries	$ 2.5	$ 3.9	$ 3.5	$ 6.4