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Common Equity (Capital Transactions With Subsidiaries) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Common stock dividends | $ 208.3 | $ 199.3 | $ 188.1
IPL [Member] |  |  |
Common stock dividends | 128.1 | 122.9 | 73.4
Repayments of capital | 0 | 0 | (100.7)
Total distributions from common equity | 128.1 | 122.9 | 174.1
WPL [Member] |  |  |
Common stock dividends | 116.3 | 112.0 | 112.1
Repayments of capital | 0 | 0 | 0
Total distributions from common equity | 116.3 | 112.0 | 112.1
Resources [Member] |  |  |
Common stock dividends | 0 | 0 | 0
Repayments of capital | (95.0) | 0 | 0
Total distributions from common equity | $ 95.0 | $ 0 | $ 0

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- Definition The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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