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Segments Of Business (Schedule Of Segments Of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | $ 750.3 | $ 718.0 | $ 1,703.1 | $ 1,577.6
Operating income (loss) | 103.3 | 103.2 | 257.5 | 223.9
Income (loss) from continuing operations, net of tax | 62.1 | 65.9 | 170.1 | 138.8
Income (loss) from discontinued operations, net of tax | (0.3) | (0.6) | (0.3) | (3.6)
Net income (loss) attributable to common shareowners | 61.8 | 65.3 | 169.8 | 135.2
IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 411.9 | 383.4 | 940.8 | 861.3
Operating income (loss) | 34.0 | 34.7 | 91.5 | 75.8
Net income (loss) attributable to common shareowners | 18.4 | 22.2 | 61.8 | 45.1
WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 324.5 | 319.9 | 734.9 | 689.7
Operating income (loss) | 60.0 | 59.7 | 147.7 | 132.4
Net income (loss) attributable to common shareowners | 34.6 | 34.4 | 89.4 | 76.4
Electric [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 643.9 | 612.1 | 1,319.7 | 1,245.3
Operating income (loss) | 89.1 | 85.9 | 183.4 | 159.5
Electric [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 354.6 | 329.6 | 728.8 | 679.8
Operating income (loss) | 29.0 | 29.4 | 55.5 | 46.6
Electric [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 289.3 | 282.5 | 590.9 | 565.5
Operating income (loss) | 60.1 | 56.5 | 127.9 | 112.9
Gas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 76.9 | 73.4 | 317.6 | 270.7
Operating income (loss) | 2.7 | 5.6 | 45.7 | 42.9
Gas [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 43.7 | 42.0 | 179.4 | 156.3
Operating income (loss) | 1.6 | 2.6 | 24.9 | 23.3
Gas [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 33.2 | 31.4 | 138.2 | 114.4
Operating income (loss) | 1.1 | 3.0 | 20.8 | 19.6
Other Utilities [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 15.6 | 17.8 | 38.4 | 35.0
Operating income (loss) | 2.2 | 2.9 | 10.1 | 5.8
Other Utilities [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 13.6 | 11.8 | 32.6 | 25.2
Operating income (loss) | 3.4 | 2.7 | 11.1 | 5.9
Other Utilities [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 2.0 | 6.0 | 5.8 | 9.8
Operating income (loss) | (1.2) | 0.2 | (1.0) | (0.1)
Utilities Business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 736.4 | 703.3 | 1,675.7 | 1,551.0
Operating income (loss) | 94.0 | 94.4 | 239.2 | 208.2
Income (loss) from continuing operations, net of tax | 53.0 | 56.6 | 151.2 | 121.5
Income (loss) from discontinued operations, net of tax | 0 | 0 | 0 | 0
Net income (loss) attributable to common shareowners | 53.0 | 56.6 | 151.2 | 121.5
Non-Regulated [Member] | Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 13.9 | 14.7 | 27.4 | 26.6
Operating income (loss) | 9.3 | 8.8 | 18.3 | 15.7
Income (loss) from continuing operations, net of tax | 9.1 | 9.3 | 18.9 | 17.3
Income (loss) from discontinued operations, net of tax | (0.3) | (0.6) | (0.3) | (3.6)
Net income (loss) attributable to common shareowners | $ 8.8 | $ 8.7 | $ 18.6 | $ 13.7

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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