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Equity Investments (Tables)
3 Months Ended
Mar. 31, 2021
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, 2020$149.0 
Equity in ATC Earnings5.3 
Distributed ATC Earnings(4.3)
Amortization of the Remeasurement of Deferred Income Taxes0.3 
Equity Investment Balance as of March 31, 2021$150.3 
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, 2020$152.2 
Cash Investments1.0 
Equity in Nobles 2 Earnings (a)
(0.5)
Distributed Nobles 2 Earnings(1.5)
Equity Investment Balance as of March 31, 2021$151.2 
(a)The Company also recorded net loss attributable to non-controlling interest of $1.4 million related to its investment in Nobles 2.