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Business Segment (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 01, 2021
USD ($)
Dec. 31, 2021
USD ($)
a
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
a
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]                                
Number of Reportable Segments                           3 3  
Revenue   $ 399.0 $ 345.4 $ 335.6 $ 339.2 $ 320.4 $ 293.9 $ 243.2 $ 311.6 $ 304.6 $ 288.3 $ 290.4 $ 357.2 $ 1,419.2 $ 1,169.1 $ 1,240.5
Other – Non-utility                           11.4 11.3 11.6
Net Income Attributable to ALLETE   61.9 $ 27.6 $ 27.9 $ 51.8 47.1 $ 40.7 $ 20.1 $ 66.3 $ 49.7 $ 31.2 $ 34.2 $ 70.5 169.2 174.2 185.6
Depreciation, Depletion and Amortization                           231.7 217.8 202.0
Interest Expense                           69.1 65.6 64.9
Equity Earnings                           20.0 22.1 21.7
Income Tax Expense (Benefit)                           (26.9) (39.5) (6.6)
Assets   6,435.0       6,084.6               6,435.0 6,084.6  
Property, Plant and Equipment, Additions                           476.4 657.2  
Consolidation, Eliminations [Member]                                
Segment Reporting Information [Line Items]                                
Interest Expense [1]                           $ (2.9) (8.3) (5.0)
Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Number of Operating Segments                           3    
Depreciation, Depletion and Amortization                           $ 170.7 166.9 159.4
Interest Expense [1]                           57.3 58.5 58.9
Equity Earnings                           21.3 22.3 21.7
Income Tax Expense (Benefit)                           (16.6) (19.4) (7.1)
Property, Plant and Equipment, Additions                           166.8 133.7  
Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue                           1,227.9 987.3 1,042.4
Net Income Attributable to ALLETE [2]                           129.1 136.3 154.4
Assets   $ 4,289.4       4,196.8               $ 4,289.4 4,196.8  
Corporate and Other [Member]                                
Segment Reporting Information [Line Items]                                
Number of Operating Segments                           2    
Land in Minnesota (Acres) | a   4,000                       4,000    
Revenue                           $ 104.4 102.2 105.1
Net Income Attributable to ALLETE [2],[3],[4]                           13.8 8.0 19.9
Depreciation, Depletion and Amortization                           11.8 13.0 13.5
Interest Expense [1]                           13.2 13.2 8.0
Equity Earnings                           (1.3) (0.2) 0.0
Income Tax Expense (Benefit) [5]                           6.3 (1.0) 12.8
Assets   $ 426.2       404.5               426.2 404.5  
Property, Plant and Equipment, Additions                           39.7 15.7  
Gain on Sale of Affiliate, After-tax                           13.2    
Income Tax Expense (Benefit), Due to Sale of Subsidiary                           10.4    
Corporate and Other [Member] | Nemadji Trail Energy Center [Member] | South Shore Energy                                
Segment Reporting Information [Line Items]                                
Gain on Sale After Tax $ 8.5                         8.5    
ALLETE Clean Energy [Member]                                
Segment Reporting Information [Line Items]                                
Revenue                           86.9 79.6 59.6
Net Income Attributable to ALLETE [2]                           26.3 29.9 12.4
Depreciation, Depletion and Amortization                           49.2 37.9 26.8
Interest Expense [1]                           1.5 2.2 2.8
Income Tax Expense (Benefit)                           (16.6) (19.1) (11.9)
Assets   $ 1,719.4       $ 1,483.3               1,719.4 1,483.3  
Property, Plant and Equipment, Additions                           269.9 507.8  
U.S. Water Services [Member]                                
Segment Reporting Information [Line Items]                                
Revenue [3]                           0.0 0.0 33.4
Net Income Attributable to ALLETE [2]                           0.0 0.0 (1.1)
Depreciation, Depletion and Amortization                           0.0 0.0 2.3
Interest Expense [1]                           0.0 0.0 0.2
Income Tax Expense (Benefit)                           0.0 0.0 (0.4)
Residential [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           160.8 140.7 139.6
Commercial [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           168.6 139.5 145.7
Municipal [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           52.0 41.2 48.6
Industrial [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           565.5 432.8 476.4
Other Power Suppliers [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           168.7 138.8 153.7
CIP Financial Incentive [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax [6]                           2.4 2.4 2.8
Other [Member] | Regulated Operations [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           109.9 91.9 75.6
Long-term PSA [Member] | ALLETE Clean Energy [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           75.5 68.3 48.0
ALLETE Clean Energy Other [Member] | ALLETE Clean Energy [Member]                                
Segment Reporting Information [Line Items]                                
Other – Non-utility                           11.4 11.3 11.6
Point-in-Time [Member] | U.S. Water Services [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax [3]                           0.0 0.0 19.0
Contract [Member] | U.S. Water Services [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax [3]                           0.0 0.0 9.2
Capital Project [Member] | U.S. Water Services [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax [3]                           0.0 0.0 5.2
Long-term Contract [Member] | Corporate and Other [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           84.4 86.0 82.8
Corporate & Other - Other [Member] | Corporate and Other [Member]                                
Segment Reporting Information [Line Items]                                
Revenue from Contract with Customer, Excluding Assessed Tax                           $ 20.0 $ 16.2 $ 22.3
[1] Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation.    
[2] Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation. 
[3] In 2019, ALLETE sold U.S. Water Services. The Company recognized a gain on the sale of $13.2 million after-tax which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[4] In 2021, South Shore Energy sold a portion of its undivided ownership interest in NTEC to Basin. The closing of the transaction resulted in the recognition of an approximately $8.5 million after-tax gain which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[5] In 2019, ALLETE sold U.S. Water Services. The Company recognized income tax expense of $10.4 million for the gain on sale of U.S. Water Services which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
[6] See Note 4. Regulatory Matters.