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Equity Investments (Tables)
 12 Months Ended
Dec. 31, 2021
ATC [Member]  
Equity Investments [Line Items]  
Equity Investments [Table Text Block]
ALLETE’s Investment in ATC  
Year Ended December 3120212020
Millions  
Equity Investment Beginning Balance$149.0 $141.6 
Cash Investments— 2.7 
Equity in ATC Earnings21.3 22.3 
Distributed ATC Earnings(17.2)(18.9)
Amortization of the Remeasurement of Deferred Income Taxes1.4 1.3 
Equity Investment Ending Balance$154.5 $149.0 

ATC Summarized Financial Data  
Balance Sheet Data  
As of December 3120212020
Millions  
Current Assets$89.8 $92.8 
Non-Current Assets5,628.1 5,400.5 
Total Assets$5,717.9 $5,493.3 
Current Liabilities$436.9 $310.8 
Long-Term Debt2,513.0 2,512.2 
Other Non-Current Liabilities422.0 378.2 
Members’ Equity2,346.0 2,292.1 
Total Liabilities and Members’ Equity$5,717.9 $5,493.3 
Income Statement Data   
Year Ended December 31202120202019
Millions   
Revenue$754.8 $758.1 $744.4 
Operating Expense376.2 372.4 373.5 
Other Expense113.9 110.9 110.5 
Net Income$264.7 $274.8 $260.4 
ALLETE’s Equity in Net Income$21.3 $22.3 $21.7 
Nobles 2 [Member]  
Equity Investments [Line Items]  
Equity Investments [Table Text Block]
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2020$152.2 
Cash Investments17.6
Equity in Nobles 2 Earnings (a)
(1.3)
Distributed Nobles 2 Earnings(5.0)
Equity Investment Balance as of December 31, 2021$163.5 
(a)The Company also recorded net loss attributable to non-controlling interest of $6.6 million related to its investment in Nobles 2