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Condensed Consolidated Statements Of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Utility:        
Electric $ 643.9 $ 612.1 $ 1,319.7 $ 1,245.3
Gas 76.9 73.4 317.6 270.7
Other 15.6 17.8 38.4 35.0
Non-regulated 13.9 14.7 27.4 26.6
Total operating revenues 750.3 718.0 1,703.1 1,577.6
Utility:        
Electric production fuel and energy purchases 214.1 158.0 428.0 337.1
Purchased electric capacity 0 52.0 24.8 109.0
Electric transmission service 105.5 99.6 219.6 203.3
Cost of gas sold 45.0 38.9 206.9 166.9
Other operation and maintenance 160.7 147.2 321.7 297.4
Non-regulated operation and maintenance 1.8 3.1 3.1 5.3
Depreciation and amortization 95.8 92.7 191.3 185.3
Taxes other than income taxes 24.1 23.3 50.2 49.4
Total operating expenses 647.0 614.8 1,445.6 1,353.7
Operating income 103.3 103.2 257.5 223.9
Interest expense and other:        
Interest expense 45.1 42.5 90.3 85.1
Equity income from unconsolidated investments, net (11.3) (10.9) (22.7) (21.6)
Allowance for funds used during construction (8.4) (7.0) (17.5) (12.6)
Interest income and other 0.1 (0.3) (1.6) (1.1)
Total interest expense and other 25.5 24.3 48.5 49.8
Income from continuing operations before income taxes 77.8 78.9 209.0 174.1
Income tax expense (benefit) 13.2 10.5 33.8 22.6
Income from continuing operations, net of tax 64.6 68.4 175.2 151.5
Income (loss) from discontinued operations, net of tax (0.3) (0.6) (0.3) (3.6)
Net income (loss) 64.3 67.8 174.9 147.9
Preferred dividend requirements of subsidiaries 2.5 2.5 5.1 12.7
Net income (loss) attributable to common shareowners 61.8 65.3 169.8 135.2
Weighted average number of common shares outstanding (basic and diluted) (in shares) 110.8 110.8 110.8 110.8
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) $ 0.56 $ 0.59 $ 1.53 $ 1.25
Income (loss) from discontinued operations, net of tax (in dollars per share) $ 0.00 $ 0.00 $ 0.00 $ (0.03)
Net income (in dollars per share) $ 0.56 $ 0.59 $ 1.53 $ 1.22
Amounts attributable to common shareowners:        
Income from continuing operations, net of tax 62.1 65.9 170.1 138.8
Income (loss) from discontinued operations, net of tax (0.3) (0.6) (0.3) (3.6)
Net income (loss) attributable to common shareowners 61.8 65.3 169.8 135.2
Dividends declared per common share (in dollars per share) $ 0.51 $ 0.47 $ 1.02 $ 0.94
IPL [Member]
        
Utility:        
Electric 354.6 329.6 728.8 679.8
Gas 43.7 42.0 179.4 156.3
Other 13.6 11.8 32.6 25.2
Total operating revenues 411.9 383.4 940.8 861.3
Utility:        
Electric production fuel and energy purchases 122.9 74.9 238.1 171.6
Purchased electric capacity 0 36.2 24.8 77.6
Electric transmission service 75.4 71.4 159.0 146.0
Cost of gas sold 25.7 21.8 113.8 93.9
Other operation and maintenance 92.1 83.2 189.3 173.7
Depreciation and amortization 48.9 47.6 97.6 95.2
Taxes other than income taxes 12.9 13.6 26.7 27.5
Total operating expenses 377.9 348.7 849.3 785.5
Operating income 34.0 34.7 91.5 75.8
Interest expense and other:        
Interest expense 22.6 19.7 45.1 39.3
Allowance for funds used during construction (6.0) (4.7) (12.0) (8.5)
Interest income and other (0.1) (0.1) (0.1) (0.2)
Total interest expense and other 16.5 14.9 33.0 30.6
Income from continuing operations before income taxes 17.5 19.8 58.5 45.2
Income tax expense (benefit) (3.4) (4.9) (8.4) (11.0)
Net income (loss) 20.9 24.7 66.9 56.2
Preferred dividend requirements of subsidiaries 2.5 2.5 5.1 11.1
Net income (loss) attributable to common shareowners 18.4 22.2 61.8 45.1
Amounts attributable to common shareowners:        
Net income (loss) attributable to common shareowners 18.4 22.2 61.8 45.1
WPL [Member]
        
Utility:        
Electric 289.3 282.5 590.9 565.5
Gas 33.2 31.4 138.2 114.4
Other 2.0 6.0 5.8 9.8
Total operating revenues 324.5 319.9 734.9 689.7
Utility:        
Electric production fuel and energy purchases 91.2 83.1 189.9 165.5
Purchased electric capacity 0 15.8 0 31.4
Electric transmission service 30.1 28.2 60.6 57.3
Cost of gas sold 19.3 17.1 93.1 73.0
Other operation and maintenance 68.6 64.0 132.4 123.7
Depreciation and amortization 44.7 43.2 89.4 86.3
Taxes other than income taxes 10.6 8.8 21.8 20.1
Total operating expenses 264.5 260.2 587.2 557.3
Operating income 60.0 59.7 147.7 132.4
Interest expense and other:        
Interest expense 21.1 21.3 42.2 42.6
Equity income from unconsolidated investments, net (11.4) (10.8) (22.8) (21.6)
Allowance for funds used during construction (2.4) (2.3) (5.5) (4.1)
Interest income and other 0.3 0.1 0.3 0
Total interest expense and other 7.6 8.3 14.2 16.9
Income from continuing operations before income taxes 52.4 51.4 133.5 115.5
Income tax expense (benefit) 17.8 17.0 44.1 37.5
Net income (loss) 34.6 34.4 89.4 78.0
Preferred dividend requirements of subsidiaries 0 0 0 1.6
Net income (loss) attributable to common shareowners 34.6 34.4 89.4 76.4
Amounts attributable to common shareowners:        
Net income (loss) attributable to common shareowners $ 34.6 $ 34.4 $ 89.4 $ 76.4