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Benefit Plans (Employees Participate In Defined Contribution Retirement Plans) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
401(k) costs | $ 5.3 |  | $ 4.7 |  | $ 17.3 |  | $ 14.7 |
IPL [Member] |  |  |  |  |  |  |  |
401(k) costs | 2.7 | [1] | 2.4 | [1] | 8.4 | [1] | 7.6 | [1]
WPL [Member] |  |  |  |  |  |  |  |
401(k) costs | $ 2.4 | [1] | $ 2.1 | [1] | $ 8.3 | [1] | $ 6.5 | [1]
[1] | IPL’s and WPL’s amounts include allocated costs associated with Corporate Services employees.

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration