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Equity Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]  
Equity Investments
ALLETE’s Investment in ATC  
Year Ended December 3120232022
Millions  
Equity Investment Beginning Balance$165.4 $154.5 
Cash Investments8.2 5.9 
Equity in ATC Earnings23.1 19.3 
Distributed ATC Earnings(18.3)(15.5)
Amortization of the Remeasurement of Deferred Income Taxes1.3 1.2 
Equity Investment Ending Balance$179.7 $165.4 

ATC Summarized Financial Data  
Balance Sheet Data  
As of December 3120232022
Millions  
Current Assets$115.2 $89.6 
Non-Current Assets6,337.0 5,997.8 
Total Assets$6,452.2 $6,087.4 
Current Liabilities$495.9 $511.9 
Long-Term Debt2,736.0 2,613.0 
Other Non-Current Liabilities585.2 485.8 
Members’ Equity2,635.1 2,476.7 
Total Liabilities and Members’ Equity$6,452.2 $6,087.4 
Income Statement Data   
Year Ended December 31202320222021
Millions   
Revenue$818.9 $751.2 $754.8 
Operating Expense407.6 381.5 376.2 
Other Expense131.7 122.9 113.9 
Net Income$279.6 $246.8 $264.7 
ALLETE’s Equity in Net Income$23.1 $19.3 $21.3 
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2022$157.3 
Equity in Nobles 2 Earnings (a)
(1.4)
Distributed Nobles 2 Earnings(4.4)
Equity Investment Balance as of December 31, 2023$151.5 
(a)The Company also recorded net loss attributable to non-controlling interest of $10.2 million related to its investment in Nobles 2