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Debt (Narrative) (Details) (IPL [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended |
--- | --- | ---
Jul. 31, 2014 Subsequent Event [Member] | Jun. 30, 2014 5% pollution control revenue bond, due 2014 Pollution Control Revenue Bonds [Member]
Debt Instrument [Line Items] |  |
Retirement of long-term debt | $ 38.4 |
Interest rate |  | 5.00%

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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