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Condensed Consolidated Statements Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Utility: |  |
Electric | $ 633.2 | $ 572.4
Gas | 197.3 | 167.1
Other | 17.2 | 13.7
Non-regulated | 11.9 | 12.5
Total operating revenues | 859.6 | 765.7
Utility: |  |
Electric production fuel and energy purchases | 179.1 | 159.9
Purchased electric capacity | 57.0 | 61.5
Electric transmission service | 103.7 | 81.4
Cost of gas sold | 128.0 | 104.8
Other operation and maintenance | 150.2 | 150.0
Non-regulated operation and maintenance | 2.2 | 4.2
Depreciation and amortization | 92.6 | 83.0
Taxes other than income taxes | 26.1 | 25.3
Total operating expenses | 738.9 | 670.1
Operating income | 120.7 | 95.6
Interest expense and other: |  |
Interest expense | 42.6 | 38.9
Equity income from unconsolidated investments, net | (10.7) | (9.4)
Allowance for funds used during construction | (5.6) | (3.8)
Interest income and other | (0.8) | (1.1)
Total interest expense and other | 25.5 | 24.6
Income from continuing operations before income taxes | 95.2 | 71.0
Income tax expense (benefit) | 12.1 | 27.7
Income from continuing operations, net of tax | 83.1 | 43.3
Income (loss) from discontinued operations, net of tax | (3.0) | (4.4)
Net income (loss) | 80.1 | 38.9
Preferred dividend requirements of subsidiaries | 10.2 | 4.0
Net income (loss) attributable to common shareowners | 69.9 | 34.9
Weighted average number of common shares outstanding (basic) (000s) (in shares) | 110,767 | 110,716
Weighted average number of common shares outstanding (diluted) (000s) (in shares) | 110,776 | 110,741
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted): |  |
Income from continuing operations, net of tax (in dollars per share) | $ 0.66 | $ 0.36
Income (loss) from discontinued operations, net of tax (in dollars per share) | $ (0.03) | $ (0.04)
Net income (in dollars per share) | $ 0.63 | $ 0.32
Amounts attributable to common shareowners: |  |
Income from continuing operations, net of tax | 72.9 | 39.3
Income (loss) from discontinued operations, net of tax | (3.0) | (4.4)
Net income (loss) attributable to common shareowners | 69.9 | 34.9
Dividends declared per common share (in dollars per share) | $ 0.47 | $ 0.45
IPL [Member] |  |
Utility: |  |
Electric | 350.2 | 293.1
Gas | 114.3 | 92.8
Other | 13.4 | 12.8
Total operating revenues | 477.9 | 398.7
Utility: |  |
Electric production fuel and energy purchases | 96.7 | 74.1
Purchased electric capacity | 41.4 | 41.0
Electric transmission service | 74.6 | 55.5
Cost of gas sold | 72.1 | 57.3
Other operation and maintenance | 90.5 | 86.9
Depreciation and amortization | 47.6 | 46.7
Taxes other than income taxes | 13.9 | 13.3
Total operating expenses | 436.8 | 374.8
Operating income | 41.1 | 23.9
Interest expense and other: |  |
Interest expense | 19.6 | 19.7
Allowance for funds used during construction | (3.8) | (1.5)
Interest income and other | (0.1) | (0.2)
Total interest expense and other | 15.7 | 18.0
Income from continuing operations before income taxes | 25.4 | 5.9
Income tax expense (benefit) | (6.1) | 7.4
Net income (loss) | 31.5 | (1.5)
Preferred dividend requirements of subsidiaries | 8.6 | 3.2
Net income (loss) attributable to common shareowners | 22.9 | (4.7)
Amounts attributable to common shareowners: |  |
Net income (loss) attributable to common shareowners | 22.9 | (4.7)
WPL [Member] |  |
Utility: |  |
Electric | 283.0 | 279.3
Gas | 83.0 | 74.3
Other | 3.8 | 0.9
Total operating revenues | 369.8 | 354.5
Utility: |  |
Electric production fuel and energy purchases | 82.4 | 85.8
Purchased electric capacity | 15.6 | 20.5
Electric transmission service | 29.1 | 25.9
Cost of gas sold | 55.9 | 47.5
Other operation and maintenance | 59.7 | 63.1
Depreciation and amortization | 43.1 | 35.8
Taxes other than income taxes | 11.3 | 11.3
Total operating expenses | 297.1 | 289.9
Operating income | 72.7 | 64.6
Interest expense and other: |  |
Interest expense | 21.3 | 20.0
Equity income from unconsolidated investments, net | (10.8) | (10.1)
Allowance for funds used during construction | (1.8) | (2.3)
Interest income and other | (0.1) | (0.1)
Total interest expense and other | 8.6 | 7.5
Income from continuing operations before income taxes | 64.1 | 57.1
Income tax expense (benefit) | 20.5 | 25.2
Net income (loss) | 43.6 | 31.9
Preferred dividend requirements of subsidiaries | 1.6 | 0.8
Net income (loss) attributable to common shareowners | 42.0 | 31.1
Amounts attributable to common shareowners: |  |
Net income (loss) attributable to common shareowners | $ 42.0 | $ 31.1

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