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Equity Investments (Tables)
3 Months Ended
Mar. 31, 2023
ATC [Member]  
Investment in ATC [Line Items]  
Equity Method Investments (Table Text Block)
ALLETE’s Investment in ATC 
Millions 
Equity Investment Balance as of December 31, 2022$165.4 
Cash Investments0.8 
Equity in ATC Earnings6.0 
Distributed ATC Earnings(4.8)
Amortization of the Remeasurement of Deferred Income Taxes0.4 
Equity Investment Balance as of March 31, 2023$167.8 
Nobles 2 [Member]  
Investment in ATC [Line Items]  
Equity Method Investments (Table Text Block)
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2022$157.3 
Equity in Nobles 2 Earnings (a)
— 
Distributed Nobles 2 Earnings(1.2)
Equity Investment Balance as of March 31, 2023$156.1 
(a)The Company also recorded earnings from net loss attributable to non-controlling interest of $3.3 million related to its investment in Nobles 2.