v2.4.0.6

Segments Of Business (Schedule Of Segment Of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 750.9 | $ 887.6 | $ 690.3 | $ 765.7 | $ 760.8 | $ 870.9 | $ 712.5 | $ 877.2 | $ 3,094.5 | $ 3,221.4 | $ 3,262.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 332.4 | 321.0 | 287.3
Operating income (loss) | 101.6 | 213.7 | 108.8 | 95.6 | 106.0 | 209.4 | 70.6 | 127.3 | 519.7 | 513.3 | 560.0
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 134.8 | 146.3 | 144.8
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (41.3) | (39.3) | (38.1)
Interest income and other |  |  |  |  |  |  |  |  | (4.0) | (4.3) | (4.6)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 89.4 | 69.2 | 147.7
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 340.8 | 341.4 | 310.2
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (5.1) | (19.5) | (3.9)
Net income |  |  |  |  |  |  |  |  | 335.7 | 321.9 | 306.3
Preferred dividends |  |  |  |  |  |  |  |  | 15.9 | 18.3 | 18.7
Net income attributable to Alliant Energy common shareowners | 68.3 | 150.7 | 65.9 | 34.9 | 57.0 | 122.0 | 51.1 | 73.5 | 319.8 | 303.6 | 287.6
Total assets | 10,785.5 |  |  |  | 9,687.9 |  |  |  | 10,785.5 | 9,687.9 | 9,282.9
Investments in equity method subsidiaries | 266.6 |  |  |  | 249.6 |  |  |  | 266.6 | 249.6 | 238.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 1,158.1 | 673.4 | 866.9
IPL and WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments (in segments) |  |  |  |  |  |  |  |  | 3 |  |
IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 393.2 | 497.7 | 360.7 | 398.7 | 404.0 | 484.5 | 374.1 | 477.5 | 1,650.3 | 1,740.1 | 1,795.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 188.9 | 179.1 | 177.0
Operating income (loss) | 29.0 | 112.0 | 35.4 | 23.9 | 26.3 | 116.5 | 18.5 | 47.1 | 200.3 | 208.4 | 261.9
Interest income and other |  |  |  |  |  |  |  |  | (0.2) | (0.2) | (0.5)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (19.8) | (3.6) | 42.3
Net income | 25.6 | 106.5 | 19.6 | (1.5) | 9.8 | 101.4 | 1.0 | 27.1 | 150.2 | 139.3 | 143.4
Preferred dividends |  |  |  |  |  |  |  |  | 12.6 | 15.0 | 15.4
Net income attributable to Alliant Energy common shareowners | 22.4 | 103.3 | 16.6 | (4.7) | 6.6 | 98.3 | (2.3) | 21.7 | 137.6 | 124.3 | 128.0
Total assets | 5,457.0 |  |  |  | 5,093.5 |  |  |  | 5,457.0 | 5,093.5 |
WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 345.2 | 376.6 | 315.7 | 354.5 | 344.5 | 374.6 | 326.8 | 388.5 | 1,392.0 | 1,434.4 | 1,423.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 140.9 | 140.1 | 108.6
Operating income (loss) | 65.3 | 93.4 | 61.5 | 64.6 | 73.2 | 86.9 | 45.5 | 74.8 | 284.8 | 280.4 | 278.8
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (42.1) | (38.7) | (37.8)
Interest income and other |  |  |  |  |  |  |  |  | (0.1) | 0 | (0.1)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 94.6 | 81.9 | 98.3
Net income | 41.0 | 56.7 | 36.1 | 31.9 | 42.7 | 51.4 | 25.0 | 44.4 | 165.7 | 163.5 | 152.3
Preferred dividends |  |  |  |  |  |  |  |  | 3.3 | 3.3 | 3.3
Net income attributable to Alliant Energy common shareowners | 40.2 | 55.9 | 35.2 | 31.1 | 41.9 | 50.6 | 24.1 | 43.6 | 162.4 | 160.2 | 149.0
Total assets | 4,762.6 |  |  |  | 4,044.0 |  |  |  | 4,762.6 | 4,044.0 |
Electric [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,589.3 | 2,635.8 | 2,674.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 299.3 | 289.0 | 255.1
Operating income (loss) |  |  |  |  |  |  |  |  | 426.2 | 444.2 | 489.8
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (42.1) | (38.7) | (37.8)
Total assets | 8,438.8 |  |  |  | 7,524.5 |  |  |  | 8,438.8 | 7,524.5 | 7,227.2
Investments in equity method subsidiaries | 264.3 |  |  |  | 246.5 |  |  |  | 264.3 | 246.5 | 236.0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 994.0 | 542.7 | 729.1
Electric [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,371.1 | 1,408.3 | 1,464.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 171.2 | 161.3 | 157.1
Operating income (loss) |  |  |  |  |  |  |  |  | 166.2 | 181.6 | 239.7
Total assets | 4,500.9 |  |  |  | 4,208.2 |  |  |  | 4,500.9 | 4,208.2 | 4,025.3
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 291.0 | 245.6 | 298.8
Electric [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,218.2 | 1,227.5 | 1,209.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 128.1 | 127.7 | 98.0
Operating income (loss) |  |  |  |  |  |  |  |  | 260.0 | 262.6 | 250.1
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (42.1) | (38.7) | (37.8)
Total assets | 3,937.9 |  |  |  | 3,316.3 |  |  |  | 3,937.9 | 3,316.3 | 3,201.9
Investments in equity method subsidiaries | 264.3 |  |  |  | 246.5 |  |  |  | 264.3 | 246.5 | 236.0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 703.0 | 297.1 | 430.3
Gas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 396.3 | 476.7 | 480.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 29.1 | 28.4 | 25.2
Operating income (loss) |  |  |  |  |  |  |  |  | 51.5 | 47.8 | 53.4
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 814.8 |  |  |  | 831.9 |  |  |  | 814.8 | 831.9 | 817.6
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 31.4 | 38.0 | 39.9
Gas [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 226.7 | 276.3 | 274.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 16.3 | 16.0 | 14.6
Operating income (loss) |  |  |  |  |  |  |  |  | 24.2 | 20.6 | 23.6
Total assets | 479.5 |  |  |  | 471.1 |  |  |  | 479.5 | 471.1 | 460.3
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 16.4 | 21.2 | 20.0
Gas [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 169.6 | 200.4 | 206.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 12.8 | 12.4 | 10.6
Operating income (loss) |  |  |  |  |  |  |  |  | 27.3 | 27.2 | 29.8
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 335.3 |  |  |  | 360.8 |  |  |  | 335.3 | 360.8 | 357.3
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 15.0 | 16.8 | 19.9
Other Utility [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 56.7 | 62.0 | 64.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.4 | 1.8 | 5.3
Operating income (loss) |  |  |  |  |  |  |  |  | 7.4 | (3.2) | (2.5)
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 966.0 |  |  |  | 781.1 |  |  |  | 966.0 | 781.1 | 782.4
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 0.1 | 27.4 | 64.3
Other Utility [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 52.5 | 55.5 | 57.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 1.4 | 1.8 | 5.3
Operating income (loss) |  |  |  |  |  |  |  |  | 9.9 | 6.2 | (1.4)
Total assets | 476.6 |  |  |  | 414.2 |  |  |  | 476.6 | 414.2 | 452.0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 0.1 | 26.9 | 64.0
Other Utility [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 4.2 | 6.5 | 7.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | (2.5) | (9.4) | (1.1)
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 489.4 |  |  |  | 366.9 |  |  |  | 489.4 | 366.9 | 330.4
Investments in equity method subsidiaries | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 0 | 0.5 | 0.3
Total [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 3,042.3 | 3,174.5 | 3,219.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 329.8 | 319.2 | 285.6
Operating income (loss) |  |  |  |  |  |  |  |  | 485.1 | 488.8 | 540.7
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 136.8 | 146.6 | 142.8
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (42.1) | (38.7) | (37.8)
Interest income and other |  |  |  |  |  |  |  |  | 0.3 | 0.2 | (0.6)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 74.8 | 78.3 | 140.6
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 315.9 | 302.8 | 295.7
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 315.9 | 302.8 | 295.7
Preferred dividends |  |  |  |  |  |  |  |  | 15.9 | 18.3 | 18.7
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 300.0 | 284.5 | 277.0
Total assets | 10,219.6 |  |  |  | 9,137.5 |  |  |  | 10,219.6 | 9,137.5 | 8,827.2
Investments in equity method subsidiaries | 264.3 |  |  |  | 246.5 |  |  |  | 264.3 | 246.5 | 236.0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 1,025.5 | 608.1 | 833.3
Total [Member] | IPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,650.3 | 1,740.1 | 1,795.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 188.9 | 179.1 | 177.0
Operating income (loss) |  |  |  |  |  |  |  |  | 200.3 | 208.4 | 261.9
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 70.1 | 72.9 | 76.7
Interest income and other |  |  |  |  |  |  |  |  | (0.2) | (0.2) | (0.5)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (19.8) | (3.6) | 42.3
Net income |  |  |  |  |  |  |  |  | 150.2 | 139.3 | 143.4
Preferred dividends |  |  |  |  |  |  |  |  | 12.6 | 15.0 | 15.4
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 137.6 | 124.3 | 128.0
Total assets | 5,457.0 |  |  |  | 5,093.5 |  |  |  | 5,457.0 | 5,093.5 | 4,937.6
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 307.5 | 293.7 | 382.8
Total [Member] | WPL [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,392.0 | 1,434.4 | 1,423.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 140.9 | 140.1 | 108.6
Operating income (loss) |  |  |  |  |  |  |  |  | 284.8 | 280.4 | 278.8
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | 66.7 | 73.7 | 66.1
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | (42.1) | (38.7) | (37.8)
Interest income and other |  |  |  |  |  |  |  |  | (0.1) |  | (0.1)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 94.6 | 81.9 | 98.3
Net income |  |  |  |  |  |  |  |  | 165.7 | 163.5 | 152.3
Preferred dividends |  |  |  |  |  |  |  |  | 3.3 | 3.3 | 3.3
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 162.4 | 160.2 | 149.0
Total assets | 4,762.6 |  |  |  | 4,044.0 |  |  |  | 4,762.6 | 4,044.0 | 3,889.6
Investments in equity method subsidiaries | 264.3 |  |  |  | 246.5 |  |  |  | 264.3 | 246.5 | 236.0
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | 718.0 | 314.4 | 450.5
Non-Regulated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 52.2 | 46.9 | 42.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 2.6 | 1.8 | 1.7
Operating income (loss) |  |  |  |  |  |  |  |  | 34.6 | 24.5 | 19.3
Interest expense, net of AFUDC |  |  |  |  |  |  |  |  | (2.0) | (0.3) | 2.0
Equity income from unconsolidated investments, net |  |  |  |  |  |  |  |  | 0.8 | (0.6) | (0.3)
Interest income and other |  |  |  |  |  |  |  |  | 3.7 | 4.1 | (4.0)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 14.6 | (9.1) | 7.1
Income from continuing operations, net of tax |  |  |  |  |  |  |  |  | 24.9 | 38.6 | 14.5
Loss from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (5.1) | (19.5) | (3.9)
Net income |  |  |  |  |  |  |  |  | 19.8 | 19.1 | 10.6
Preferred dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  |  |  | 19.8 | 19.1 | 10.6
Total assets | 565.9 |  |  |  | 550.4 |  |  |  | 565.9 | 550.4 | 455.7
Investments in equity method subsidiaries | 2.3 |  |  |  | 3.1 |  |  |  | 2.3 | 3.1 | 2.5
Construction and acquisition expenditures |  |  |  |  |  |  |  |  | $ 132.6 | $ 65.3 | $ 33.6

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