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Benefit Plans (Carrying Value Of Entity's Deferred Compensation Obligations Interest And Equity Accounts) (Details) (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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| Defined Benefit Plan Disclosure [Line Items] | ||
| Carrying value of deferred compensation obligations | $ 16.3 | $ 20.5 |
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IPL [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Carrying value of deferred compensation obligations | $ 5.0 | $ 5.0 |