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Condensed Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 54.8 $ 56.9
Accounts receivable, less allowance for doubtful accounts 297.3 427.3
Production fuel, at weighted average cost 78.8 83.8
Materials and supplies, at weighted average cost 82.3 72.9
Gas stored underground, at weighted average cost 24.1 67.1
Regulatory assets 71.1 68.1
Other 435.5 267.0
Total current assets 1,043.9 1,043.1
Property, plant and equipment, net 9,173.5 8,938.4
Investments:    
Investment in American Transmission Company LLC 293.5 286.5
Other 56.4 58.4
Total investments 349.9 344.9
Other assets:    
Regulatory assets 1,706.8 1,715.6
Deferred charges and other 38.2 43.9
Total other assets 1,745.0 1,759.5
Total assets 12,312.3 12,085.9
Current liabilities:    
Current maturities of long-term debt 33.5 183.0
Commercial paper 120.9 141.3
Accounts payable 374.9 427.9
Regulatory liabilities 197.7 200.1
Other 264.5 262.4
Total current liabilities 991.5 1,214.7
Long-term debt, net (excluding current portion) 3,717.4 3,606.7
Other liabilities:    
Deferred income tax liabilities 2,449.1 2,321.1
Regulatory liabilities 572.4 621.1
Pension and other benefit obligations 417.4 421.7
Other 342.8 260.1
Total other liabilities $ 3,781.7 $ 3,624.0
Commitments and contingencies (Note 13)    
Common equity:    
Common stock $ 1.1 $ 1.1
Additional paid-in capital 1,649.0 1,509.1
Retained earnings 1,979.3 1,938.0
Accumulated other comprehensive loss (0.6) (0.6)
Shares in deferred compensation trust - 206,419 and 238,935 shares at a weighted average cost of $38.82 and $37.45 per share (8.0) (8.9)
Total common equity 3,620.8 3,438.7
Cumulative preferred stock of Interstate Power and Light Company 200.0 200.0
Noncontrolling interest 0.9 1.8
Total equity 3,821.7 3,640.5
Total liabilities and equity 12,312.3 12,085.9
IPL [Member]    
Current assets:    
Cash and cash equivalents 2.0 5.3
Accounts receivable, less allowance for doubtful accounts 104.2 216.7
Production fuel, at weighted average cost 44.9 52.7
Materials and supplies, at weighted average cost 47.5 42.0
Gas stored underground, at weighted average cost 8.2 30.8
Regulatory assets 28.0 38.7
Other 308.1 169.9
Total current assets 542.9 556.1
Property, plant and equipment, net 4,687.8 4,554.7
Investments:    
Total investments 19.5 19.1
Other assets:    
Regulatory assets 1,322.7 1,319.2
Deferred charges and other 15.0 12.7
Total other assets 1,337.7 1,331.9
Total assets 6,587.9 6,461.8
Current liabilities:    
Current maturities of long-term debt 0.0 150.0
Commercial paper 0.0  
Accounts payable 222.1 259.6
Accounts payable to associated companies 43.6 31.3
Regulatory liabilities 129.5 129.7
Other 148.0 135.3
Total current liabilities 543.2 705.9
Long-term debt, net (excluding current portion) 1,730.2 1,618.7
Other liabilities:    
Deferred income tax liabilities 1,418.8 1,341.4
Regulatory liabilities 402.5 453.8
Pension and other benefit obligations 141.5 142.4
Other 243.0 185.5
Total other liabilities $ 2,205.8 $ 2,123.1
Commitments and contingencies (Note 13)    
Common equity:    
Common stock $ 33.4 $ 33.4
Additional paid-in capital 1,342.8 1,242.8
Retained earnings 532.5 537.9
Total common equity 1,908.7 1,814.1
Cumulative preferred stock of Interstate Power and Light Company 200.0 200.0
Total equity 2,108.7 2,014.1
Total liabilities and equity 6,587.9 6,461.8
WPL [Member]    
Current assets:    
Cash and cash equivalents 48.8 46.7
Accounts receivable, less allowance for doubtful accounts 166.6 185.8
Production fuel, at weighted average cost 33.9 31.1
Materials and supplies, at weighted average cost 32.8 29.2
Gas stored underground, at weighted average cost 15.9 36.3
Regulatory assets 43.1 29.4
Deferred income tax assets 61.0 37.5
Other 51.9 61.2
Total current assets 454.0 457.2
Property, plant and equipment, net 4,028.4 3,938.9
Investments:    
Investment in American Transmission Company LLC 293.5 286.5
Other 19.0 19.5
Total investments 312.5 306.0
Other assets:    
Regulatory assets 384.1 396.4
Deferred charges and other 23.8 29.7
Total other assets 407.9 426.1
Total assets 5,202.8 5,128.2
Current liabilities:    
Current maturities of long-term debt 30.6 30.6
Commercial paper 0.0  
Accounts payable 98.0 112.9
Accounts payable to associated companies 18.0 25.5
Regulatory liabilities 68.2 70.4
Other 82.4 70.9
Total current liabilities 297.2 310.3
Long-term debt, net (excluding current portion) 1,543.5 1,543.3
Other liabilities:    
Deferred income tax liabilities 1,014.9 970.0
Regulatory liabilities 169.9 167.3
Capital lease obligations - Sheboygan Falls Energy Facility 86.6 89.4
Pension and other benefit obligations 179.0 180.4
Other 177.9 155.2
Total other liabilities $ 1,628.3 $ 1,562.3
Commitments and contingencies (Note 13)    
Common equity:    
Common stock $ 66.2 $ 66.2
Additional paid-in capital 959.0 959.0
Retained earnings 698.7 678.6
Total common equity 1,723.9 1,703.8
Noncontrolling interest 9.9 8.5
Total equity 1,733.8 1,712.3
Total liabilities and equity $ 5,202.8 $ 5,128.2