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Benefit Plans (Expected Benefit Payments) (Details) (Scenario, Forecast [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | $ 88.2
Expected benefit payments, 2015 | 84.7
Expected benefit payments, 2016 | 82.6
Expected benefit payments, 2017 | 84.1
Expected benefit payments, 2018 | 87.9
Expected benefit payments, 2019 - 2023 | 462.1
Defined Benefit Plans Qualified And Non Qualified Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 71.2
Expected benefit payments, 2015 | 68.0
Expected benefit payments, 2016 | 66.3
Expected benefit payments, 2017 | 67.8
Expected benefit payments, 2018 | 71.2
Expected benefit payments, 2019 - 2023 | 378.6
Other Postretirement Benefits Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 17.0
Expected benefit payments, 2015 | 16.7
Expected benefit payments, 2016 | 16.3
Expected benefit payments, 2017 | 16.3
Expected benefit payments, 2018 | 16.7
Expected benefit payments, 2019 - 2023 | 83.5
IPL [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 39.9
Expected benefit payments, 2015 | 37.2
Expected benefit payments, 2016 | 38.4
Expected benefit payments, 2017 | 39.8
Expected benefit payments, 2018 | 41.6
Expected benefit payments, 2019 - 2023 | 215.8
IPL [Member] | Defined Benefit Plans Qualified And Non Qualified Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 32.2
Expected benefit payments, 2015 | 29.9
Expected benefit payments, 2016 | 31.3
Expected benefit payments, 2017 | 32.8
Expected benefit payments, 2018 | 34.4
Expected benefit payments, 2019 - 2023 | 180.4
IPL [Member] | Other Postretirement Benefits Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 7.7
Expected benefit payments, 2015 | 7.3
Expected benefit payments, 2016 | 7.1
Expected benefit payments, 2017 | 7.0
Expected benefit payments, 2018 | 7.2
Expected benefit payments, 2019 - 2023 | 35.4
WPL [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 33.3
Expected benefit payments, 2015 | 34.2
Expected benefit payments, 2016 | 33.8
Expected benefit payments, 2017 | 35.0
Expected benefit payments, 2018 | 36.3
Expected benefit payments, 2019 - 2023 | 189.7
WPL [Member] | Defined Benefit Plans Qualified And Non Qualified Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 26.4
Expected benefit payments, 2015 | 27.2
Expected benefit payments, 2016 | 27.1
Expected benefit payments, 2017 | 28.3
Expected benefit payments, 2018 | 29.4
Expected benefit payments, 2019 - 2023 | 155.8
WPL [Member] | Other Postretirement Benefits Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Expected benefit payments, 2014 | 6.9
Expected benefit payments, 2015 | 7.0
Expected benefit payments, 2016 | 6.7
Expected benefit payments, 2017 | 6.7
Expected benefit payments, 2018 | 6.9
Expected benefit payments, 2019 - 2023 | $ 33.9

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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