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Consolidated Statements Of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Utility:      
Electric $ 2,689.0 $ 2,589.3 $ 2,635.8
Gas 464.8 396.3 476.7
Other 71.3 56.7 62.0
Non-regulated 51.7 52.2 46.9
Total operating revenues 3,276.8 3,094.5 3,221.4
Utility:      
Electric production fuel and energy purchases 725.0 712.3 764.5
Purchased electric capacity 216.8 271.5 257.2
Electric transmission service 418.3 341.3 323.8
Cost of gas sold 276.7 217.2 295.2
Other operation and maintenance 620.7 590.0 630.2
Non-regulated operation and maintenance 14.9 11.9 18.0
Depreciation and amortization 370.9 332.4 321.0
Taxes other than income taxes 99.6 98.2 98.2
Total operating expenses 2,742.9 2,574.8 2,708.1
Operating income 533.9 519.7 513.3
Interest expense and other:      
Interest expense 172.8 156.7 158.3
Equity (income) loss from unconsolidated investments, net (43.7) (41.3) (39.3)
Allowance for funds used during construction (30.8) (21.9) (12.0)
Interest income and other (0.4) (4.0) (4.3)
Total interest expense and other 97.9 89.5 102.7
Income from continuing operations before income taxes 436.0 430.2 410.6
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 dividend requirements of subsidiaries 17.9 15.9 18.3
Net income (loss) attributable to common shareowners 358.3 319.8 303.6
Weighted average number of common shares outstanding (basic and diluted) (000s) (in shares) 110.8 110.8 110.7
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) $ 3.29 $ 2.93 $ 2.92
Loss from discontinued operations, net of tax (in dollars per share) $ (0.06) $ (0.04) $ (0.18)
Net income (in dollars per share) $ 3.23 $ 2.89 $ 2.74
Amounts attributable to common shareowners:      
Income from continuing operations, net of tax 364.2 324.9 323.1
Loss from discontinued operations, net of tax (5.9) (5.1) (19.5)
Net income (loss) attributable to common shareowners 358.3 319.8 303.6
IPL [Member]
     
Utility:      
Electric 1,491.8 1,371.1 1,408.3
Gas 273.9 226.7 276.3
Other 53.1 52.5 55.5
Total operating revenues 1,818.8 1,650.3 1,740.1
Utility:      
Electric production fuel and energy purchases 382.1 344.5 383.1
Purchased electric capacity 155.2 153.7 147.7
Electric transmission service 301.4 235.0 219.2
Cost of gas sold 160.3 124.9 175.6
Other operation and maintenance 362.3 350.0 375.0
Depreciation and amortization 191.1 188.9 179.1
Taxes other than income taxes 54.4 53.0 52.0
Total operating expenses 1,606.8 1,450.0 1,531.7
Operating income 212.0 200.3 208.4
Interest expense and other:      
Interest expense 81.3 78.5 78.7
Allowance for funds used during construction (21.0) (8.4) (5.8)
Interest income and other (0.3) (0.2) (0.2)
Total interest expense and other 60.0 69.9 72.7
Income from continuing operations before income taxes 152.0 130.4 135.7
Income tax expense (benefit) (37.9) (19.8) (3.6)
Net income 189.9 150.2 139.3
Preferred dividend requirements of subsidiaries 16.3 12.6 15.0
Net income (loss) attributable to common shareowners 173.6 137.6 124.3
Amounts attributable to common shareowners:      
Net income (loss) attributable to common shareowners 173.6 137.6 124.3
WPL [Member]
     
Utility:      
Electric 1,197.2 1,218.2 1,227.5
Gas 190.9 169.6 200.4
Other 18.2 4.2 6.5
Total operating revenues 1,406.3 1,392.0 1,434.4
Utility:      
Electric production fuel and energy purchases 342.9 367.8 381.4
Purchased electric capacity 61.6 117.8 109.5
Electric transmission service 116.9 106.3 104.6
Cost of gas sold 116.4 92.3 119.6
Other operation and maintenance 258.4 240.0 255.2
Depreciation and amortization 172.2 140.9 140.1
Taxes other than income taxes 41.8 42.1 43.6
Total operating expenses 1,110.2 1,107.2 1,154.0
Operating income 296.1 284.8 280.4
Interest expense and other:      
Interest expense 85.0 80.2 79.9
Equity (income) loss from unconsolidated investments, net (43.7) (42.1) (38.7)
Allowance for funds used during construction (9.8) (13.5) (6.2)
Interest income and other (0.1) (0.1) 0
Total interest expense and other 31.4 24.5 35.0
Income from continuing operations before income taxes 264.7 260.3 245.4
Income tax expense (benefit) 87.2 94.6 81.9
Net income 177.5 165.7 163.5
Preferred dividend requirements of subsidiaries 1.6 3.3 3.3
Net income (loss) attributable to common shareowners 175.9 162.4 160.2
Amounts attributable to common shareowners:      
Net income (loss) attributable to common shareowners $ 175.9 $ 162.4 $ 160.2