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Condensed Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 7.3 $ 8.2
Accounts receivable, less allowance for doubtful accounts 424.9 493.3
Production fuel, at weighted average cost 84.7 98.1
Gas stored underground, at weighted average cost 22.2 37.6
Materials and supplies, at weighted average cost 94.7 86.6
Regulatory assets 68.5 57.8
Other 112.4 95.5
Total current assets 814.7 877.1
Property, plant and equipment, net 10,608.1 10,279.2
Investments:    
ATC Investment 335.2 317.6
Other 19.3 20.0
Total investments 354.5 337.6
Other assets:    
Regulatory assets 1,947.5 1,857.3
Deferred charges and other 18.6 22.6
Total other assets 1,966.1 1,879.9
Total assets 13,743.4 13,373.8
Current liabilities:    
Current maturities of long-term debt 5.2 4.6
Commercial paper 368.6 244.1
Accounts payable 381.1 445.3
Regulatory liabilities 187.6 186.2
Other 265.7 281.8
Total current liabilities 1,208.2 1,162.0
Long-term debt, net (excluding current portion) 4,354.3 4,315.6
Other liabilities:    
Deferred tax liabilities 2,681.3 2,570.2
Regulatory liabilities 478.2 494.8
Pension and other benefit obligations 482.7 489.9
Other 288.3 279.3
Total other liabilities 3,930.5 3,834.2
Commitments and contingencies (Note 12)
Common equity:    
Common stock 2.3 2.3
Additional paid-in capital 1,830.4 1,693.1
Retained earnings 2,228.6 2,177.0
Accumulated other comprehensive loss (0.4) (0.4)
Shares in deferred compensation trust - 450,173 and 441,695 shares at a weighted average cost of $23.25 and $22.71 per share (10.5) (10.0)
Total common equity 4,050.4 3,862.0
Cumulative preferred stock of Interstate Power and Light Company 200.0 200.0
Total equity 4,250.4 4,062.0
Total liabilities and equity 13,743.4 13,373.8
IPL [Member]    
Current assets:    
Cash and cash equivalents 4.0 3.3
Accounts receivable, less allowance for doubtful accounts 194.7 240.7
Production fuel, at weighted average cost 59.8 70.3
Gas stored underground, at weighted average cost 8.2 16.3
Materials and supplies, at weighted average cost 51.8 46.5
Regulatory assets 24.4 17.7
Other 36.9 27.7
Total current assets 379.8 422.5
Property, plant and equipment, net 5,586.5 5,435.6
Other assets:    
Regulatory assets 1,532.2 1,441.1
Deferred charges and other 8.6 5.5
Total other assets 1,540.8 1,446.6
Total assets 7,507.1 7,304.7
Current liabilities:    
Commercial paper 0.0  
Accounts payable 163.8 186.3
Regulatory liabilities 132.4 149.6
Other 194.7 185.9
Total current liabilities 490.9 521.8
Long-term debt, net (excluding current portion) 2,194.5 2,153.5
Other liabilities:    
Deferred tax liabilities 1,586.9 1,511.8
Regulatory liabilities 283.3 281.2
Pension and other benefit obligations 171.9 173.2
Other 228.6 214.2
Total other liabilities 2,270.7 2,180.4
Commitments and contingencies (Note 12)
Common equity:    
Common stock 33.4 33.4
Additional paid-in capital 1,697.8 1,597.8
Retained earnings 619.8 617.8
Total common equity 2,351.0 2,249.0
Cumulative preferred stock of Interstate Power and Light Company 200.0 200.0
Total equity 2,551.0 2,449.0
Total liabilities and equity 7,507.1 7,304.7
WPL [Member]    
Current assets:    
Cash and cash equivalents 2.8 4.2
Accounts receivable, less allowance for doubtful accounts 193.1 226.3
Production fuel, at weighted average cost 24.9 27.8
Gas stored underground, at weighted average cost 14.0 21.3
Materials and supplies, at weighted average cost 39.6 36.3
Regulatory assets 44.1 40.1
Other 63.8 60.5
Total current assets 382.3 416.5
Property, plant and equipment, net 4,635.0 4,426.7
Other assets:    
Regulatory assets 415.3 416.2
Deferred charges and other 23.5 30.9
Total other assets 438.8 447.1
Total assets 5,456.1 5,290.3
Current liabilities:    
Commercial paper 212.5 52.3
Accounts payable 150.7 192.9
Regulatory liabilities 55.2 36.6
Other 112.6 112.9
Total current liabilities 531.0 394.7
Long-term debt, net (excluding current portion) 1,535.9 1,535.2
Other liabilities:    
Deferred tax liabilities 1,000.0 971.6
Regulatory liabilities 194.9 213.6
Capital lease obligations - Sheboygan Falls Energy Facility 73.8 77.2
Pension and other benefit obligations 205.3 207.8
Other 163.8 159.4
Total other liabilities 1,637.8 1,629.6
Commitments and contingencies (Note 12)
Common equity:    
Common stock 66.2 66.2
Additional paid-in capital 1,019.0 1,019.0
Retained earnings 666.2 645.6
Total common equity 1,751.4 1,730.8
Total liabilities and equity $ 5,456.1 $ 5,290.3