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Consolidated Balance Sheet - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Current Assets [Abstract]    
Cash and Cash Equivalents $ 45.1 $ 44.3
Accounts Receivable (Less Allowance of $1.8 and $2.5) 123.7 111.9
Inventories – Net 97.7 74.2
Prepayments and Other 24.8 24.5
Total Current Assets 291.3 254.9
Property, Plant and Equipment – Net 5,100.2 4,840.8
Regulatory Assets 511.8 480.9
Equity Investments 318.0 301.2
Other Non-Current Assets 213.7 206.8
Total Assets 6,435.0 6,084.6
Current Liabilities [Abstract]    
Accounts Payable 111.0 110.0
Accrued Taxes 65.1 59.4
Accrued Interest 20.1 19.8
Long-Term Debt Due Within One Year 214.2 203.7
Other 133.0 66.7
Total Current Liabilities 543.4 459.6
Long-Term Debt 1,763.2 1,593.2
Deferred Income Taxes 185.7 195.7
Regulatory Liabilities 536.1 524.8
Defined Benefit Pension and Other Postretirement Benefit Plans 179.5 225.8
Other Non-Current Liabilities 280.8 285.3
Total Liabilities 3,488.7 3,284.4
Commitments, Guarantees and Contingencies (Note 8)
ALLETE Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 53.2 and 52.1 Shares Issued and Outstanding 1,536.7 1,460.9
Accumulated Other Comprehensive Loss (23.8) (31.1)
Retained Earnings 900.2 864.8
Total ALLETE Equity 2,413.1 2,294.6
Non-Controlling Interest in Subsidiaries 533.2 505.6
Total Equity 2,946.3 2,800.2
Total Liabilities and Equity $ 6,435.0 $ 6,084.6