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Receivables (Receivables Sold Under The Agreement) (Details) (IPL [Member], USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
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IPL [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||
| Customer accounts receivable | $ 137.9 | $ 122.4 | ||||
| Unbilled utility revenues | 64.7 | 65.4 | ||||
| Other receivables | 8.3 | 7.5 | ||||
| Receivables sold | 210.9 | 195.3 | ||||
| Less: cash proceeds | 55.0 | [1] | 140.0 | [1] | ||
| Deferred proceeds | 155.9 | 55.3 | ||||
| Less: allowance for doubtful accounts | 2.0 | 1.6 | ||||
| Fair value of deferred proceeds | 153.9 | 53.7 | ||||
| Outstanding receivables past due | $ 16.6 | $ 15.9 | ||||
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