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Condensed Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Utility:    
Electric plant in service $ 9,228.4 $ 9,070.7
Gas plant in service 901.4 878.4
Other plant in service 521.6 506.2
Accumulated depreciation (3,689.3) (3,513.0)
Net plant 6,962.1 6,942.3
Construction work in progress:    
Columbia Energy Center Units 1 and 2 emission controls (WPL) 247.9 130.4
Ottumwa Generating Station Unit 1 emission controls (IPL) 124.8 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) 106.6 66.9
Other 222.9 147.8
Other, less accumulated depreciation 21.0 21.2
Total utility 7,685.3 7,382.3
Non-regulated and other:    
Non-regulated Generation, less accumulated depreciation 251.4 258.6
Alliant Energy Corporate Services, Inc. and other, less accumulated depreciation 204.7 197.1
Total non-regulated and other 456.1 455.7
Total property, plant and equipment 8,141.4 7,838.0
Current assets:    
Cash and cash equivalents 17.7 21.2
Accounts receivable, less allowance for doubtful accounts:    
Customer 78.1 94.9
Unbilled utility revenues 64.7 81.4
Other 188.6 209.4
Production fuel, at weighted average cost 105.2 103.1
Materials and supplies, at weighted average cost 71.1 63.1
Gas stored underground, at weighted average cost 44.2 37.7
Regulatory assets 60.3 83.5
Deferred income tax assets 131.2 170.2
Other 119.0 129.8
Total current assets 880.1 994.3
Investments:    
Investment in American Transmission Company LLC 268.3 257.0
Other 56.4 62.0
Total investments 324.7 319.0
Other assets:    
Regulatory assets 1,535.9 1,528.9
Deferred charges and other 99.1 105.3
Total other assets 1,635.0 1,634.2
Total assets 10,981.2 10,785.5
Common equity:    
Common stock 1.1 1.1
Additional paid-in capital 1,506.9 1,511.2
Retained earnings 1,767.3 1,630.7
Accumulated other comprehensive loss (0.8) (0.8)
Shares in deferred compensation trust - 222,415 and 216,030 shares at a weighted average cost of $34.87 and $33.61 per share (7.8) (7.3)
Total common equity 3,266.7 3,134.9
Cumulative preferred stock (Interstate Power and Light Company) 200.0 145.1
Noncontrolling interest 1.8 1.8
Total equity 3,468.5 3,281.8
Cumulative preferred stock (Wisconsin Power and Light Company) 0 60.0
Long-term debt, net (excluding current portion) 3,104.8 3,136.6
Total capitalization 6,573.3 6,478.4
Current liabilities:    
Current maturities of long-term debt 48.4 1.5
Commercial paper 237.3 217.5
Accounts payable 368.7 339.3
Regulatory liabilities 174.9 189.7
Other 223.5 272.0
Total current liabilities 1,052.8 1,020.0
Other long-term liabilities and deferred credits:    
Deferred income tax liabilities 2,063.9 1,934.2
Regulatory liabilities 662.7 726.4
Pension and other benefit obligations 356.6 364.0
Other 271.9 262.5
Total long-term liabilities and deferred credits 3,355.1 3,287.1
Commitments and contingencies (Note 12)      
Total capitalization and liabilities 10,981.2 10,785.5
IPL [Member]
    
Utility:    
Electric plant in service 4,902.3 4,815.2
Gas plant in service 451.8 441.4
Other plant in service 299.0 289.1
Accumulated depreciation (2,014.3) (1,930.7)
Net plant 3,638.8 3,615.0
Construction work in progress:    
Ottumwa Generating Station Unit 1 emission controls (IPL) 124.8 73.7
George Neal Generating Station Units 3 and 4 emission controls (IPL) 106.6 66.9
Other 131.5 82.8
Other, less accumulated depreciation 19.8 19.8
Non-regulated and other:    
Total property, plant and equipment 4,021.5 3,858.2
Current assets:    
Cash and cash equivalents 6.3 4.5
Accounts receivable, less allowance for doubtful accounts:    
Customer 130.1 95.0
Income tax refunds receivable 30.0 14.9
Production fuel, at weighted average cost 70.6 75.2
Materials and supplies, at weighted average cost 39.6 33.3
Gas stored underground, at weighted average cost 25.3 17.2
Regulatory assets 33.4 47.6
Deferred income tax assets 75.7 79.3
Other 38.9 24.6
Total current assets 449.9 391.6
Investments:    
Total investments 17.9 17.6
Other assets:    
Regulatory assets 1,182.6 1,170.3
Deferred charges and other 21.9 19.3
Total other assets 1,204.5 1,189.6
Total assets 5,693.8 5,457.0
Common equity:    
Common stock 33.4 33.4
Additional paid-in capital 1,122.9 1,037.8
Retained earnings 507.4 448.0
Total common equity 1,663.7 1,519.2
Cumulative preferred stock (Interstate Power and Light Company) 200.0 145.1
Total equity 1,863.7 1,664.3
Long-term debt, net (excluding current portion) 1,336.4 1,359.5
Total capitalization 3,200.1 3,023.8
Current liabilities:    
Current maturities of long-term debt 38.4 0
Commercial paper 0 26.3
Accounts payable 195.1 163.2
Accounts payable to associated companies 53.3 29.3
Regulatory liabilities 116.6 130.1
Other 113.9 119.9
Total current liabilities 517.3 468.8
Other long-term liabilities and deferred credits:    
Deferred income tax liabilities 1,161.0 1,087.3
Regulatory liabilities 513.8 571.3
Pension and other benefit obligations 120.2 122.9
Other 181.4 182.9
Total long-term liabilities and deferred credits 1,976.4 1,964.4
Commitments and contingencies (Note 12)      
Total capitalization and liabilities 5,693.8 5,457.0
WPL [Member]
    
Utility:    
Electric plant in service 4,326.1 4,255.5
Gas plant in service 449.6 437.0
Other plant in service 222.6 217.1
Accumulated depreciation (1,675.0) (1,582.3)
Net plant 3,323.3 3,327.3
Leased Sheboygan Falls Energy Facility, less accumulated amortization 72.4 77.0
Construction work in progress:    
Columbia Energy Center Units 1 and 2 emission controls (WPL) 247.9 130.4
Other 91.4 65.0
Other, less accumulated depreciation 1.2 1.4
Non-regulated and other:    
Total property, plant and equipment 3,736.2 3,601.1
Current assets:    
Cash and cash equivalents 6.6 0.7
Accounts receivable, less allowance for doubtful accounts:    
Customer 70.6 83.3
Unbilled utility revenues 64.7 81.4
Other 41.9 48.5
Production fuel, at weighted average cost 34.6 27.9
Materials and supplies, at weighted average cost 29.7 28.5
Gas stored underground, at weighted average cost 18.9 20.5
Regulatory assets 26.9 35.9
Deferred income tax assets 44.9 85.6
Other 49.5 56.4
Total current assets 388.3 468.7
Investments:    
Investment in American Transmission Company LLC 268.3 257.0
Other 19.2 19.6
Total investments 287.5 276.6
Other assets:    
Regulatory assets 353.3 358.6
Deferred charges and other 51.3 57.6
Total other assets 404.6 416.2
Total assets 4,816.6 4,762.6
Common equity:    
Common stock 66.2 66.2
Additional paid-in capital 959.0 959.2
Retained earnings 608.1 557.6
Total common equity 1,633.3 1,583.0
Cumulative preferred stock (Wisconsin Power and Light Company) 0 60.0
Long-term debt, net (excluding current portion) 1,323.5 1,331.5
Total capitalization 2,956.8 2,974.5
Current liabilities:    
Current maturities of long-term debt 8.5 0
Commercial paper 143.4 86.6
Accounts payable 117.9 126.4
Accounts payable to associated companies 20.8 13.2
Regulatory liabilities 58.3 59.6
Accrued taxes 11.2 28.3
Other 59.2 71.4
Total current liabilities 419.3 385.5
Other long-term liabilities and deferred credits:    
Deferred income tax liabilities 885.4 844.1
Regulatory liabilities 148.9 155.1
Capital lease obligations - Sheboygan Falls Energy Facility 95.7 99.1
Pension and other benefit obligations 156.8 159.7
Other 153.7 144.6
Total long-term liabilities and deferred credits 1,440.5 1,402.6
Commitments and contingencies (Note 12)      
Total capitalization and liabilities $ 4,816.6 $ 4,762.6