|
Receivables (Maximum And Average Outstanding Cash Proceeds) (Details) (IPL [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Costs incurred | $ 0.4 | $ 0.3 | $ 1.1 | $ 1.1 |
|
Maximum [Member]
|
||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Outstanding aggregate cash proceeds (based on daily outstanding balances) | 150.0 | 160.0 | 160.0 | 160.0 |
|
Average [Member]
|
||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Outstanding aggregate cash proceeds (based on daily outstanding balances) | $ 95.0 | $ 125.4 | $ 124.2 | $ 114.0 |