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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jul. 31, 2014 IPL [Member] | Sep. 30, 2014 IPL [Member] | Sep. 30, 2013 IPL [Member] | Oct. 31, 2014 Subsequent Event [Member] | Oct. 31, 2014 Subsequent Event [Member] WPL [Member]
Debt [Line Items] |  |  |  |  |  |  |
Retirement of long-term debt | $ 47.7 | $ 0.8 | $ 38.4 | $ 38.4 | $ 0 | $ 250.0 |
Interest rate |  |  | 5.00% |  |  | 4.00% | 4.10%
Proceeds from issuance of long-term debt |  |  |  |  |  | $ 250 | $ 250
Interest rate, variable |  |  |  |  |  | 0.75% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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