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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 05, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Cash, Cash Equivalents and Restricted Cash [Abstract]          
Cash and Cash Equivalents   $ 29.9 $ 36.4 $ 60.1 $ 45.1
Restricted Cash included in Prepayments and Other   7.4 1.5 7.1 0.3
Restricted Cash included in Other Non-Current Assets   2.3 2.3 7.8 2.3
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows   39.6 40.2 75.0 47.7
Inventories – Net [Abstract]          
Fuel [1]   39.6 33.4    
Materials and Supplies   119.2 75.1    
Renewable Energy Facilities Under Development [2]   188.1 347.4    
Total Inventories – Net   346.9 455.9    
Other Non-Current Assets [Abstract]          
Contract Assets [3]   20.3 21.0    
Operating Lease, Right-of-Use Asset   11.8 12.7    
ALLETE Properties   19.5 19.1    
Restricted Cash, Non-Current   2.3 2.3 $ 7.8 $ 2.3
Other Postretirement Benefit Plans   59.6 58.8    
Other   93.5 90.4    
Total Other Non-Current Assets   207.0 204.3    
Other Current Liabilites [Abstract]          
Customer Deposits [4]   10.3 150.7    
PSAs   6.1 6.1    
Public Utilities Reserve for Interim Rates   23.5 18.4    
Manufactured Gas Plant - Current [5]   14.5 14.7    
Operating Lease Liabilities   3.0 3.2    
Other   49.4 57.9    
Total Other Current Liabilities   106.8 251.0    
Other Non-Current Liabilities [Abstract]          
Asset Retirement Obligation [6]   204.4 200.4    
PSAs   25.4 26.9    
Operating Lease Liabilities   8.8 9.3    
Other   31.8 32.4    
Total Other Non-Current Liabilities   270.4 269.0    
Business Segments [Line Items]          
Goodwill   $ 154.9 154.9    
Goodwill, Change in Goodwill Allocation, Description   There have been no changes to goodwill by reportable segment      
ALLETE Clean Energy [Member] | Subsequent Event [Member]          
Business Segments [Line Items]          
Proceeds from Sale of Wind Project $ 160.0        
BNI Energy [Member]          
Business Segments [Line Items]          
Other Receivables   $ 32.4 $ 32.4    
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] Renewable Energy Facilities Under Development consists primarily of project costs related to ALLETE Clean Energy’s Northern Wind project sold in the first quarter of 2023 and Red Barn wind project sold in April 2023. (See Other Current Liabilities.)
[3] Contract Assets consist of payments made to customers as an incentive to execute or extend service agreements. The contract payments are being amortized over the term of the respective agreements as a reduction to revenue.
[4] Primarily related to deposits received by ALLETE Clean Energy for the Northern Wind and Red Barn wind projects sold in the first quarter of 2023 and April 2023, respectively. (See Inventories – Net.)
[5] The manufactured gas plant represents the current liability for remediation of a former manufactured gas plant site located in Superior, Wisconsin, and formerly operated by SWL&P.
[6] The asset retirement obligation is primarily related to our Regulated Operations and is funded through customer rates over the life of the related assets. Additionally, BNI Energy funds its obligation through its cost-plus coal supply agreements for which BNI Energy has recorded a receivable of $32.4 million in Other Non-Current Assets on the Consolidated Balance Sheet as of March 31, 2023, ($32.4 million as of December 31, 2022).