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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Current Assets [Abstract]    
Cash and Cash Equivalents $ 104.3 $ 101.1
Accounts Receivable (Less Allowance of $1.1 and $0.9) 73.2 79.7
Inventories 76.7 69.1
Prepayments and Other 23.8 27.1
Total Current Assets 278.0 277.0
Property, Plant and Equipment - Net 2,239.9 1,982.7
Regulatory Assets 334.6 345.9
Investment in ATC 105.5 98.9
Other Investments 139.7 132.3
Other Non-Current Assets 40.4 39.2
Total Assets 3,138.1 2,876.0
Current Liabilities [Abstract]    
Accounts Payable 57.4 71.8
Accrued Taxes 22.5 26.4
Accrued Interest 14.2 12.8
Long-Term Debt Due Within One Year 67.3 5.4
Notes Payable 0.3 1.1
Other 53.1 45.6
Total Current Liabilities 214.8 163.1
Long-Term Debt 947.6 857.9
Deferred Income Taxes 400.0 373.6
Regulatory Liabilities 54.8 43.5
Defined Benefit Pension and Other Postretirement Benefit Plans 254.0 253.5
Other Non-Current Liabilities 109.4 105.1
Total Liabilities 1,980.6 1,796.7
Commitments, Guarantees and Contingencies (Note 13)      
ALLETE's Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 38.8 and 37.5 Shares Outstanding 759.4 705.6
Unearned ESOP Shares (22.8) (29.0)
Accumulated Other Comprehensive Loss (26.7) (28.9)
Retained Earnings 447.6 431.6
Total Equity 1,157.5 1,079.3
Total Liabilities and Equity $ 3,138.1 $ 2,876.0