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Segments Of Business (Schedule Of Segment Of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 832.6 | $ 866.6 | $ 718.0 | $ 859.6 | $ 750.9 | $ 887.6 | $ 690.3 | $ 765.7 | $ 3,276.8 | $ 3,094.5 | $ 3,221.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 370.9 | 332.4 | 321.0
Operating income (loss) | 108.6 | 201.4 | 103.2 | 120.7 | 101.6 | 213.7 | 108.8 | 95.6 | 533.9 | 519.7 | 513.3
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 142.0 | 134.8 | 146.3
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (41.3) | (39.3)
Interest income and other |  |  |  |  |  |  |  |  | (0.4) | (4.0) | (4.3)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 53.9 | 89.4 | 69.2
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 382.1 | 340.8 | 341.4
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (5.9) | (5.1) | (19.5)
Net income |  |  |  |  |  |  |  |  | 376.2 | 335.7 | 321.9
Preferred dividends |  |  |  |  |  |  |  |  | 17.9 | 15.9 | 18.3
Net income attributable to Alliant Energy common shareowners | 65.5 | 157.6 | 65.3 | 69.9 | 68.3 | 150.7 | 65.9 | 34.9 | 358.3 | 319.8 | 303.6
Total assets | 11,112.4 |  |  |  | 10,785.5 |  |  |  | 11,112.4 | 10,785.5 | 9,687.9
Investments in equity method subsidiaries | 281.4 |  |  |  | 266.6 |  |  |  | 281.4 | 266.6 | 249.6
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 798.3 | 1,158.1 | 673.4
IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 463.1 | 494.4 | 383.4 | 477.9 | 393.2 | 497.7 | 360.7 | 398.7 | 1,818.8 | 1,650.3 | 1,740.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 191.1 | 188.9 | 179.1
Operating income (loss) | 36.2 | 100.0 | 34.7 | 41.1 | 29.0 | 112.0 | 35.4 | 23.9 | 212.0 | 200.3 | 208.4
Interest income and other |  |  |  |  |  |  |  |  | (0.3) | (0.2) | (0.2)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (37.9) | (19.8) | (3.6)
Net income | 21.1 | 112.6 | 24.7 | 31.5 | 25.6 | 106.5 | 19.6 | (1.5) | 189.9 | 150.2 | 139.3
Preferred dividends |  |  |  |  |  |  |  |  | 16.3 | 12.6 | 15.0
Net income attributable to Alliant Energy common shareowners | 18.5 | 110.0 | 22.2 | 22.9 | 22.4 | 103.3 | 16.6 | (4.7) | 173.6 | 137.6 | 124.3
Total assets | 5,806.0 |  |  |  | 5,457.0 |  |  |  | 5,806.0 | 5,457.0 |
WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 355.7 | 360.9 | 319.9 | 369.8 | 345.2 | 376.6 | 315.7 | 354.5 | 1,406.3 | 1,392.0 | 1,434.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 172.2 | 140.9 | 140.1
Operating income (loss) | 67.8 | 95.9 | 59.7 | 72.7 | 65.3 | 93.4 | 61.5 | 64.6 | 296.1 | 284.8 | 280.4
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (42.1) | (38.7)
Interest income and other |  |  |  |  |  |  |  |  | (0.1) | (0.1) | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 87.2 | 94.6 | 81.9
Net income | 38.2 | 61.3 | 34.4 | 43.6 | 41.0 | 56.7 | 36.1 | 31.9 | 177.5 | 165.7 | 163.5
Preferred dividends |  |  |  |  |  |  |  |  | 1.6 | 3.3 | 3.3
Net income attributable to Alliant Energy common shareowners | 38.2 | 61.3 | 34.4 | 42.0 | 40.2 | 55.9 | 35.2 | 31.1 | 175.9 | 162.4 | 160.2
Total assets | 4,804.4 |  |  |  | 4,762.6 |  |  |  | 4,804.4 | 4,762.6 |
Electric [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,689.0 | 2,589.3 | 2,635.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 333.0 | 299.3 | 289.0
Operating income (loss) |  |  |  |  |  |  |  |  | 444.5 | 426.2 | 444.2
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (42.1) | (38.7)
Total assets | 9,018.6 |  |  |  | 8,438.8 |  |  |  | 9,018.6 | 8,438.8 | 7,524.5
Investments in equity method subsidiaries | 279.1 |  |  |  | 264.3 |  |  |  | 279.1 | 264.3 | 246.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 677.3 | 994.0 | 542.7
Electric [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,491.8 | 1,371.1 | 1,408.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 173.1 | 171.2 | 161.3
Operating income (loss) |  |  |  |  |  |  |  |  | 173.1 | 166.2 | 181.6
Total assets | 4,905.3 |  |  |  | 4,500.9 |  |  |  | 4,905.3 | 4,500.9 | 4,208.2
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 365.4 | 291.0 | 245.6
Electric [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,197.2 | 1,218.2 | 1,227.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 159.9 | 128.1 | 127.7
Operating income (loss) |  |  |  |  |  |  |  |  | 271.4 | 260.0 | 262.6
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (42.1) | (38.7)
Total assets | 4,113.3 |  |  |  | 3,937.9 |  |  |  | 4,113.3 | 3,937.9 | 3,316.3
Investments in equity method subsidiaries | 279.1 |  |  |  | 264.3 |  |  |  | 279.1 | 264.3 | 246.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 311.9 | 703.0 | 297.1
Gas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 464.8 | 396.3 | 476.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 28.8 | 29.1 | 28.4
Operating income (loss) |  |  |  |  |  |  |  |  | 57.3 | 51.5 | 47.8
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 859.3 |  |  |  | 814.8 |  |  |  | 859.3 | 814.8 | 831.9
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 47.0 | 31.4 | 38.0
Gas [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 273.9 | 226.7 | 276.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 16.5 | 16.3 | 16.0
Operating income (loss) |  |  |  |  |  |  |  |  | 29.8 | 24.2 | 20.6
Total assets | 518.8 |  |  |  | 479.5 |  |  |  | 518.8 | 479.5 | 471.1
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 27.5 | 16.4 | 21.2
Gas [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 190.9 | 169.6 | 200.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 12.3 | 12.8 | 12.4
Operating income (loss) |  |  |  |  |  |  |  |  | 27.5 | 27.3 | 27.2
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 340.5 |  |  |  | 335.3 |  |  |  | 340.5 | 335.3 | 360.8
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 19.5 | 15.0 | 16.8
Other Utility [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 71.3 | 56.7 | 62.0
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.5 | 1.4 | 1.8
Operating income (loss) |  |  |  |  |  |  |  |  | 6.3 | 7.4 | (3.2)
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 732.5 |  |  |  | 966.0 |  |  |  | 732.5 | 966.0 | 781.1
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 7.3 | 0.1 | 27.4
Other Utility [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 53.1 | 52.5 | 55.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.5 | 1.4 | 1.8
Operating income (loss) |  |  |  |  |  |  |  |  | 9.1 | 9.9 | 6.2
Total assets | 381.9 |  |  |  | 476.6 |  |  |  | 381.9 | 476.6 | 414.2
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 7.3 | 0.1 | 26.9
Other Utility [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 18.2 | 4.2 | 6.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (2.8) | (2.5) | (9.4)
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 350.6 |  |  |  | 489.4 |  |  |  | 350.6 | 489.4 | 366.9
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0.5
Utility Business [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 3,225.1 | 3,042.3 | 3,174.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 363.3 | 329.8 | 319.2
Operating income (loss) |  |  |  |  |  |  |  |  | 508.1 | 485.1 | 488.8
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 135.5 | 136.8 | 146.6
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (42.1) | (38.7)
Interest income and other |  |  |  |  |  |  |  |  | (0.4) | (0.3) | (0.2)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 49.3 | 74.8 | 78.3
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 367.4 | 315.9 | 302.8
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 367.4 | 315.9 | 302.8
Preferred dividends |  |  |  |  |  |  |  |  | 17.9 | 15.9 | 18.3
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 349.5 | 300.0 | 284.5
Total assets | 10,610.4 |  |  |  | 10,219.6 |  |  |  | 10,610.4 | 10,219.6 | 9,137.5
Investments in equity method subsidiaries | 279.1 |  |  |  | 264.3 |  |  |  | 279.1 | 264.3 | 246.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 731.6 | 1,025.5 | 608.1
Utility Business [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,818.8 | 1,650.3 | 1,740.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 191.1 | 188.9 | 179.1
Operating income (loss) |  |  |  |  |  |  |  |  | 212.0 | 200.3 | 208.4
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 60.3 | 70.1 | 72.9
Interest income and other |  |  |  |  |  |  |  |  | (0.3) | (0.2) | (0.2)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (37.9) | (19.8) | (3.6)
Net income |  |  |  |  |  |  |  |  | 189.9 | 150.2 | 139.3
Preferred dividends |  |  |  |  |  |  |  |  | 16.3 | 12.6 | 15.0
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 173.6 | 137.6 | 124.3
Total assets | 5,806.0 |  |  |  | 5,457.0 |  |  |  | 5,806.0 | 5,457.0 | 5,093.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 400.2 | 307.5 | 293.7
Utility Business [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,406.3 | 1,392.0 | 1,434.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 172.2 | 140.9 | 140.1
Operating income (loss) |  |  |  |  |  |  |  |  | 296.1 | 284.8 | 280.4
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 75.2 | 66.7 | 73.7
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | (43.7) | (42.1) | (38.7)
Interest income and other |  |  |  |  |  |  |  |  | (0.1) | (0.1) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 87.2 | 94.6 | 81.9
Net income |  |  |  |  |  |  |  |  | 177.5 | 165.7 | 163.5
Preferred dividends |  |  |  |  |  |  |  |  | 1.6 | 3.3 | 3.3
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 175.9 | 162.4 | 160.2
Total assets | 4,804.4 |  |  |  | 4,762.6 |  |  |  | 4,804.4 | 4,762.6 | 4,044.0
Investments in equity method subsidiaries | 279.1 |  |  |  | 264.3 |  |  |  | 279.1 | 264.3 | 246.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 331.4 | 718.0 | 314.4
Non-Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 51.7 | 52.2 | 46.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 7.6 | 2.6 | 1.8
Operating income (loss) |  |  |  |  |  |  |  |  | 25.8 | 34.6 | 24.5
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 6.5 | (2.0) | (0.3)
Equity (income) loss from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0.8 | (0.6)
Interest income and other |  |  |  |  |  |  |  |  | 0 | (3.7) | (4.1)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 4.6 | 14.6 | (9.1)
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 14.7 | 24.9 | 38.6
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (5.9) | (5.1) | (19.5)
Net income |  |  |  |  |  |  |  |  | 8.8 | 19.8 | 19.1
Preferred dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 8.8 | 19.8 | 19.1
Total assets | 502.0 |  |  |  | 565.9 |  |  |  | 502.0 | 565.9 | 550.4
Investments in equity method subsidiaries | 2.3 |  |  |  | 2.3 |  |  |  | 2.3 | 2.3 | 3.1
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | $ 66.7 | $ 132.6 | $ 65.3

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