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Consolidated Balance Sheet - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Current Assets [Abstract]    
Cash and Cash Equivalents $ 59.0 $ 44.3
Accounts Receivable (Less Allowance of $2.1 and $2.5) 110.2 111.9
Inventories – Net 89.6 74.2
Prepayments and Other 19.9 24.5
Total Current Assets 278.7 254.9
Property, Plant and Equipment – Net 5,053.1 4,840.8
Regulatory Assets 502.9 480.9
Equity Investments 317.8 301.2
Other Non-Current Assets 179.7 206.8
Total Assets 6,332.2 6,084.6
Current Liabilities [Abstract]    
Accounts Payable 101.9 110.0
Accrued Taxes 67.4 59.4
Accrued Interest 15.3 19.8
Long-Term Debt Due Within One Year 377.4 203.7
Other 84.0 66.7
Total Current Liabilities 646.0 459.6
Long-Term Debt 1,649.4 1,593.2
Deferred Income Taxes 187.1 195.7
Regulatory Liabilities 509.5 524.8
Defined Benefit Pension and Other Postretirement Benefit Plans 207.6 225.8
Other Non-Current Liabilities 278.1 285.3
Total Liabilities 3,477.7 3,284.4
Commitments, Guarantees and Contingencies (Note 6)
Equity [Abstract]    
Common Stock Without Par Value, 80.0 Shares Authorized, 52.6 and 52.1 Shares Issued and Outstanding 1,496.5 1,460.9
Accumulated Other Comprehensive Loss (29.9) (31.1)
Retained Earnings 873.4 864.8
Total ALLETE Equity 2,340.0 2,294.6
Non-Controlling Interest in Subsidiaries 514.5 505.6
Total Equity 2,854.5 2,800.2
Total Liabilities and Equity $ 6,332.2 $ 6,084.6