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Receivables (Additional Attributes Of Receivables Sold Under The Agreement) (Details) (IPL [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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IPL [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Collections reinvested in receivables | $ 1,771.6 | $ 1,795.7 | $ 1,354.2 |
| Credit losses, net of recoveries | $ 10.0 | $ 10.9 | $ 7.9 |