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Consolidated Balance Sheet - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Current Assets [Abstract]    
Cash and Cash Equivalents $ 74.6 $ 45.1
Accounts Receivable (Less Allowance of $1.8 and $1.8) 116.2 123.7
Inventories – Net 355.8 97.7
Prepayments and Other 113.4 24.8
Total Current Assets 660.0 291.3
Property, Plant and Equipment – Net 5,027.1 5,100.2
Regulatory Assets 470.9 511.8
Equity Investments 322.0 318.0
Goodwill and Intangible Assets - Net 151.1 0.8
Other Non-Current Assets 207.9 212.9
Total Assets 6,839.0 6,435.0
Current Liabilities [Abstract]    
Accounts Payable 134.8 111.0
Accrued Taxes 52.7 65.1
Accrued Interest 20.3 20.1
Long-Term Debt Due Within One Year 390.5 214.2
Other 110.7 133.0
Total Current Liabilities 709.0 543.4
Long-Term Debt 1,595.6 1,763.2
Deferred Income Taxes 181.8 185.7
Regulatory Liabilities 532.6 536.1
Defined Benefit Pension and Other Postretirement Benefit Plans 174.6 179.5
Other Non-Current Liabilities 286.5 280.8
Total Liabilities 3,480.1 3,488.7
Commitments, Guarantees and Contingencies (Note 7)
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 57.1 and 53.2 Shares Issued and Outstanding 1,771.7 1,536.7
Accumulated Other Comprehensive Loss (23.9) (23.8)
Retained Earnings 932.6 900.2
Total ALLETE Equity 2,680.4 2,413.1
Non-Controlling Interest in Subsidiaries 678.5 533.2
Total Equity 3,358.9 2,946.3
Total Liabilities and Equity $ 6,839.0 $ 6,435.0