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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current Assets [Abstract]    
Cash and Cash Equivalents $ 83.6 $ 97.3
Accounts Receivable (Less Allowance of $1.1 and $1.1) 78.9 96.3
Inventories 75.3 59.3
Prepayments and Other 32.2 35.1
Deferred Income Taxes 23.5 19.0
Total Current Assets 293.5 307.0
Property, Plant and Equipment - Net 3,020.4 2,576.5
Regulatory Assets 270.8 263.8
Investment in ATC 118.8 114.6
Other Investments 116.7 146.3
Other Non-Current Assets 75.4 68.6
Total Assets 3,895.6 3,476.8
Current Liabilities [Abstract]    
Accounts Payable 93.2 99.9
Accrued Taxes 30.9 34.8
Accrued Interest 17.4 15.7
Long-Term Debt Due Within One Year 10.8 27.2
Other 61.1 52.6
Total Current Liabilities 213.4 230.2
Long-Term Debt 1,316.8 1,083.0
Deferred Income Taxes 496.3 479.1
Regulatory Liabilities 100.1 81.0
Defined Benefit Pension and Other Postretirement Benefit Plans 117.0 133.4
Other Non-Current Liabilities 234.5 127.2
Total Liabilities 2,478.1 2,133.9
Commitments, Guarantees and Contingencies (Note 15)      
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 42.6 and 41.4 Shares Outstanding 945.1 885.2
Unearned ESOP Shares (10.5) (14.3)
Accumulated Other Comprehensive Loss (16.3) (17.1)
Retained Earnings 497.7 489.1
Total ALLETE Equity 1,416.0 1,342.9
Non-Controlling Interest in Subsidiaries 1.5 0
Total Equity 1,417.5 1,342.9
Total Liabilities and Equity $ 3,895.6 $ 3,476.8