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Consolidated Balance Sheet - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Current Assets [Abstract]    
Cash and Cash Equivalents $ 91.9 $ 97.0
Accounts Receivable (Less Allowance of $1.5 and $1.0) 113.6 121.2
Inventories 110.4 117.1
Prepayments and Other 38.4 35.7
Total Current Assets 354.3 371.0
Property, Plant and Equipment – Net 3,631.3 3,669.1
Regulatory Assets 359.1 372.0
Investment in ATC 129.0 124.5
Other Investments 72.3 74.6
Goodwill and Intangible Assets – Net 212.7 215.2
Other Non-Current Assets 98.9 68.1
Total Assets [1] 4,857.6 4,894.5
Current Liabilities [Abstract]    
Accounts Payable 64.8 88.8
Accrued Taxes 37.7 44.0
Accrued Interest 17.8 18.6
Long-Term Debt Due Within One Year 64.5 35.7
Notes Payable 0.9 1.6
Other 85.9 86.1
Total Current Liabilities 271.6 274.8
Long-Term Debt 1,498.9 1,556.7
Deferred Income Taxes 595.1 579.8
Regulatory Liabilities 94.6 105.0
Defined Benefit Pension and Other Postretirement Benefit Plans 204.5 206.8
Other Non-Current Liabilities 340.8 349.0
Total Liabilities 3,005.5 3,072.1
Commitments, Guarantees and Contingencies (Note 13)
ALLETE's Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 49.4 and 49.1 Shares Outstanding 1,283.5 1,271.4
Accumulated Other Comprehensive Loss (24.2) (24.5)
Retained Earnings 592.8 573.3
Total ALLETE Equity 1,852.1 1,820.2
Non-Controlling Interest in Subsidiaries 0.0 2.2
Total Equity 1,852.1 1,822.4
Total Liabilities and Equity $ 4,857.6 $ 4,894.5
[1] As a result of revised accounting guidance adopted in the first quarter of 2016, we reclassified unamortized debt issuance costs from Other Non-Current Assets to Long-Term Debt on the Consolidated Balance Sheet. Prior period segment assets have been revised to conform to the current presentation. (See Note 1. Operations and Significant Accounting Policies.)