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Condensed Consolidated Statements Of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating revenues:        
Electric utility $ 680.9 $ 675.9 $ 1,358.5 $ 1,344.8
Gas utility 62.6 57.0 216.9 209.2
Other utility 11.5 12.4 23.2 25.6
Non-regulated 10.3 9.3 20.6 18.8
Total operating revenues 765.3 754.6 1,619.2 1,598.4
Operating expenses:        
Electric production fuel and purchased power 184.3 199.5 392.1 400.4
Electric transmission service 117.6 130.3 242.3 258.2
Cost of gas sold 28.3 24.6 120.5 119.8
Other operation and maintenance 145.1 144.5 298.0 289.6
Depreciation and amortization 115.0 102.1 222.0 204.6
Taxes other than income taxes 25.7 25.0 52.1 51.3
Total operating expenses 616.0 626.0 1,327.0 1,323.9
Operating income 149.3 128.6 292.2 274.5
Interest expense and other:        
Interest expense 52.8 48.0 105.1 96.0
Equity income from unconsolidated investments, net (11.3) (9.1) (22.8) (19.6)
Allowance for funds used during construction (10.1) (15.3) (27.1) (28.5)
Interest income and other (0.1) 0.0 (0.2) (0.2)
Total interest expense and other 31.3 23.6 55.0 47.7
Income from continuing operations before income taxes 118.0 105.0 237.2 226.8
Income tax expense (benefit) 21.2 18.1 38.8 39.7
Income from continuing operations, net of tax 96.8 86.9 198.4 187.1
Income (loss) from discontinued operations, net of tax 0.0 (0.5) 1.4 (1.6)
Net income 96.8 86.4 199.8 185.5
Preferred dividend requirements of Interstate Power and Light Company 2.5 2.5 5.1 5.1
Net income attributable to common shareowners $ 94.3 $ 83.9 $ 194.7 $ 180.4
Weighted average number of common shares outstanding (basic and diluted) (in shares) 229.0 227.0 228.3 226.9
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted) (in dollars per share) $ 0.41 $ 0.37 $ 0.85 $ 0.80
Amounts attributable to common shareowners:        
Income from continuing operations, net of tax $ 94.3 $ 84.4 $ 193.3 $ 182.0
Income (loss) from discontinued operations, net of tax 0.0 (0.5) 1.4 (1.6)
Net income attributable to common shareowners $ 94.3 $ 83.9 $ 194.7 $ 180.4
Dividends declared per common share (in dollars per share) $ 0.315 $ 0.29375 $ 0.63 $ 0.5875
IPL [Member]        
Operating revenues:        
Electric utility $ 372.4 $ 364.4 $ 728.6 $ 726.0
Gas utility 36.7 34.5 119.8 118.7
Other utility 11.1 12.1 22.3 25.0
Total operating revenues 420.2 411.0 870.7 869.7
Operating expenses:        
Electric production fuel and purchased power 98.0 100.4 207.5 199.8
Electric transmission service 75.1 88.3 156.8 174.8
Cost of gas sold 16.9 15.9 64.7 68.3
Other operation and maintenance 89.4 93.0 184.3 185.0
Depreciation and amortization 61.2 52.4 114.8 105.1
Taxes other than income taxes 13.3 13.0 26.7 26.7
Total operating expenses 353.9 363.0 754.8 759.7
Operating income 66.3 48.0 115.9 110.0
Interest expense and other:        
Interest expense 27.9 25.0 55.6 49.9
Allowance for funds used during construction (6.1) (12.1) (20.4) (22.4)
Interest income and other (0.2) (0.1) (0.1) (0.1)
Total interest expense and other 21.6 12.8 35.1 27.4
Income from continuing operations before income taxes 44.7 35.2 80.8 82.6
Income tax expense (benefit) (0.6) 0.8 (4.3) 0.0
Net income 45.3 34.4 85.1 82.6
Preferred dividend requirements of Interstate Power and Light Company 2.5 2.5 5.1 5.1
Net income attributable to common shareowners 42.8 31.9 80.0 77.5
Amounts attributable to common shareowners:        
Net income attributable to common shareowners 42.8 31.9 80.0 77.5
WPL [Member]        
Operating revenues:        
Electric utility 308.5 311.5 629.9 618.8
Gas utility 25.9 22.5 97.1 90.5
Other utility 0.4 0.3 0.9 0.6
Total operating revenues 334.8 334.3 727.9 709.9
Operating expenses:        
Electric production fuel and purchased power 86.3 99.1 184.6 200.6
Electric transmission service 42.5 42.0 85.5 83.4
Cost of gas sold 11.4 8.7 55.8 51.5
Other operation and maintenance 56.6 50.9 113.6 103.0
Depreciation and amortization 52.8 47.4 105.2 94.8
Taxes other than income taxes 11.5 11.2 23.5 22.8
Total operating expenses 261.1 259.3 568.2 556.1
Operating income 73.7 75.0 159.7 153.8
Interest expense and other:        
Interest expense 23.1 22.9 46.0 45.8
Equity income from unconsolidated investments, net (0.2) (9.0) (0.2) (19.7)
Allowance for funds used during construction (4.0) (3.2) (6.7) (6.1)
Interest income and other 0.0 (0.2) (0.1) (0.3)
Total interest expense and other 18.9 10.5 39.0 19.7
Income from continuing operations before income taxes 54.8 64.5 120.7 134.1
Income tax expense (benefit) 16.7 20.8 37.1 43.4
Net income 38.1 43.7 83.6 90.7
Net income attributable to noncontrolling interest 0.0 0.5 0.0 1.0
Net income attributable to common shareowners 38.1 43.2 83.6 89.7
Amounts attributable to common shareowners:        
Net income attributable to common shareowners $ 38.1 $ 43.2 $ 83.6 $ 89.7