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Segments Of Business (Schedule Of Segment Of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | $ 866.6 | $ 887.6 | $ 2,444.2 | $ 2,343.6
Operating income (loss) | 201.4 | 213.7 | 425.3 | 418.1
Income (loss) from continuing operations, net of tax | 158.9 | 149.0 | 297.7 | 253.8
Income (loss) from discontinued operations, net of tax | (1.3) | 1.7 | (4.9) | (2.3)
Net income (loss) attributable to Alliant Energy common shareowners | 157.6 | 150.7 | 292.8 | 251.5
IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 494.4 | 497.7 | 1,355.7 | 1,257.1
Operating income (loss) | 100.0 | 112.0 | 175.8 | 171.3
Net income (loss) attributable to Alliant Energy common shareowners | 110.0 | 103.3 | 155.1 | 115.2
WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 360.9 | 376.6 | 1,050.6 | 1,046.8
Operating income (loss) | 95.9 | 93.4 | 228.3 | 219.5
Net income (loss) attributable to Alliant Energy common shareowners | 61.3 | 55.9 | 137.7 | 122.2
Electric [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 798.1 | 815.3 | 2,043.4 | 2,000.3
Operating income (loss) | 199.6 | 203.1 | 359.1 | 354.0
Electric [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 457.6 | 456.6 | 1,137.4 | 1,070.7
Operating income (loss) | 99.6 | 109.5 | 146.2 | 149.3
Electric [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 340.5 | 358.7 | 906.0 | 929.6
Operating income (loss) | 100.0 | 93.6 | 212.9 | 204.7
Gas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 39.8 | 46.8 | 310.5 | 263.9
Operating income (loss) | (3.4) | 0.8 | 39.5 | 32.1
Gas [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 24.6 | 29.6 | 180.9 | 149.2
Operating income (loss) | (0.7) | 0.6 | 22.6 | 15.6
Gas [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 15.2 | 17.2 | 129.6 | 114.7
Operating income (loss) | (2.7) | 0.2 | 16.9 | 16.5
Other Utility [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 17.4 | 12.2 | 52.4 | 39.7
Operating income (loss) | (0.3) | 1.5 | 5.5 | 4.7
Other Utility [Member] | IPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 12.2 | 11.5 | 37.4 | 37.2
Operating income (loss) | 1.1 | 1.9 | 7.0 | 6.4
Other Utility [Member] | WPL [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 5.2 | 0.7 | 15.0 | 2.5
Operating income (loss) | (1.4) | (0.4) | (1.5) | (1.7)
Utility Business [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 855.3 | 874.3 | 2,406.3 | 2,303.9
Operating income (loss) | 195.9 | 205.4 | 404.1 | 390.8
Income (loss) from continuing operations, net of tax | 171.3 | 159.2 | 292.8 | 237.4
Income (loss) from discontinued operations, net of tax | 0 | 0 | 0 | 0
Net income (loss) attributable to Alliant Energy common shareowners | 171.3 | 159.2 | 292.8 | 237.4
Non-Regulated, Parent and Other [Member] | Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 11.3 | 13.3 | 37.9 | 39.7
Operating income (loss) | 5.5 | 8.3 | 21.2 | 27.3
Income (loss) from continuing operations, net of tax | (12.4) | (10.2) | 4.9 | 16.4
Income (loss) from discontinued operations, net of tax | (1.3) | 1.7 | (4.9) | (2.3)
Net income (loss) attributable to Alliant Energy common shareowners | $ (13.7) | $ (8.5) | $ 0 | $ 14.1

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