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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current Assets [Abstract]    
Cash and Cash Equivalents $ 8.6 $ 101.1
Accounts Receivable (Less Allowance of $1.1 and $0.9) 66.7 79.7
Inventories 69.3 69.1
Prepayments and Other 25.5 27.1
Total Current Assets 170.1 277.0
Property, Plant and Equipment - Net 2,177.5 1,982.7
Regulatory Assets 336.9 345.9
Investment in ATC 102.6 98.9
Other Investments 136.0 132.3
Other Non-Current Assets 39.1 39.2
Total Assets 2,962.2 2,876.0
Current Liabilities [Abstract]    
Accounts Payable 78.3 71.8
Accrued Taxes 22.6 26.4
Accrued Interest 12.8 12.8
Long-Term Debt Due Within One Year 67.4 5.4
Notes Payable 0 1.1
Other 51.3 45.6
Total Current Liabilities 232.4 163.1
Long-Term Debt 808.4 857.9
Deferred Income Taxes 388.0 373.6
Regulatory Liabilities 49.3 43.5
Defined Benefit Pension and Other Postretirement Benefit Plans 253.8 253.5
Other Non-Current Liabilities 110.6 105.1
Total Liabilities 1,842.5 1,796.7
Commitments, Guarantees and Contingencies (Note 13)      
ALLETE's Equity [Abstract]    
Common Stock Without Par Value, 80 Shares Authorized, 38.3 and 37.5 Shares Outstanding 737.3 705.6
Unearned ESOP Shares (24.9) (29.0)
Accumulated Other Comprehensive Loss (27.6) (28.9)
Retained Earnings 434.9 431.6
Total Equity 1,119.7 1,079.3
Total Liabilities and Equity $ 2,962.2 $ 2,876.0