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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash, Cash Equivalents and Restricted Cash [Abstract]        
Cash and Cash Equivalents $ 47.9 $ 36.4 $ 74.6 $ 45.1
Restricted Cash included in Prepayments and Other 0.8 1.5 0.8 0.3
Restricted Cash included in Other Non-Current Assets 2.4 2.3 6.3 2.3
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows 51.1 40.2 81.7 47.7
Inventories – Net [Abstract]        
Fuel [1] 37.7 33.4    
Materials and Supplies 122.3 75.1    
Renewable Energy Facilities Under Development [2] 34.3 347.4    
Total Inventories – Net 194.3 455.9    
Other Non-Current Assets [Abstract]        
Contract Assets [3] 19.7 21.0    
Operating Lease, Right-of-Use Asset 11.1 12.7    
ALLETE Properties 19.4 19.1    
Restricted Cash, Non-Current 2.4 2.3 $ 6.3 $ 2.3
Other Postretirement Benefit Plans 60.4 58.8    
Other 97.3 90.4    
Total Other Non-Current Assets 210.3 204.3    
Other Current Liabilites [Abstract]        
Customer Deposits [4] 9.6 150.7    
PSAs 6.0 6.1    
Public Utilities Reserve for Interim Rates 31.8 18.4    
Manufactured Gas Plant - Current [5] 9.1 14.7    
Operating Lease Liabilities 3.0 3.2    
Other 53.1 57.9    
Total Other Current Liabilities 112.6 251.0    
Other Non-Current Liabilities [Abstract]        
Asset Retirement Obligation [6] 203.6 200.4    
PSAs 23.9 26.9    
Operating Lease Liabilities 8.1 9.3    
Other 32.4 32.4    
Total Other Non-Current Liabilities 268.0 269.0    
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      
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 as of June 30, 2023 consists primarily of project costs related to renewable energy development projects at New Energy. As of December 31, 2022, it consisted primarily of project costs related to ALLETE Clean Energy’s Northern Wind and Red Barn wind projects sold in the first quarter of 2023 and second quarter of 2023, respectively. (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] Customer Deposits as of December 31, 2022 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 second quarter of 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 June 30, 2023 ($32.4 million as of December 31, 2022).