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Equity Investments (Tables)
6 Months Ended
Jun. 30, 2022
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, 2021$154.5 
Cash Investments3.9 
Equity in ATC Earnings10.7 
Distributed ATC Earnings(8.6)
Amortization of the Remeasurement of Deferred Income Taxes0.7 
Equity Investment Balance as of June 30, 2022$161.2 
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, 2021$163.5 
Equity in Nobles 2 Earnings (a)
0.1 
Distributed Nobles 2 Earnings(2.8)
Equity Investment Balance as of June 30, 2022$160.8 
(a)The Company also recorded net loss attributable to non-controlling interest of $6.2 million related to its investment in Nobles 2.