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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current Assets [Abstract]    
Cash and Cash Equivalents $ 150.5 $ 97.3
Accounts Receivable (Less Allowance of $1.0 and $1.1) 82.4 96.3
Inventories 71.6 59.3
Prepayments and Other 29.3 35.1
Deferred Income Taxes 24.0 19.0
Total Current Assets 357.8 307.0
Property, Plant and Equipment - Net 3,121.5 2,576.5
Regulatory Assets 277.1 263.8
Investment in ATC 120.7 114.6
Other Investments 116.4 146.3
Other Non-Current Assets 74.4 68.6
Total Assets 4,067.9 3,476.8
Current Liabilities [Abstract]    
Accounts Payable 92.7 99.9
Accrued Taxes 30.9 34.8
Accrued Interest 14.8 15.7
Long-Term Debt Due Within One Year 85.3 27.2
Notes Payable 2.7 0
Other 60.4 52.6
Total Current Liabilities 286.8 230.2
Long-Term Debt 1,289.2 1,083.0
Deferred Income Taxes 509.7 479.1
Regulatory Liabilities 103.1 81.0
Defined Benefit Pension and Other Postretirement Benefit Plans 116.8 133.4
Other Non-Current Liabilities 231.6 127.2
Total Liabilities 2,537.2 2,133.9
Commitments, Guarantees and Contingencies (Note 15)      
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 44.5 and 41.4 Shares Outstanding 1,035.3 885.2
Unearned ESOP Shares (8.6) (14.3)
Accumulated Other Comprehensive Loss (16.1) (17.1)
Retained Earnings 518.6 489.1
Total ALLETE Equity 1,529.2 1,342.9
Non-Controlling Interest in Subsidiaries 1.5 0
Total Equity 1,530.7 1,342.9
Total Liabilities and Equity $ 4,067.9 $ 3,476.8