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Equity Investments (Tables)
3 Months Ended
Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments We account for our investment in ATC under the equity method of accounting.
ALLETE’s Investment in ATC 
Millions 
Equity Investment Balance as of December 31, 2023$179.7 
Cash Investments1.6 
Equity in ATC Earnings5.7 
Distributed ATC Earnings(4.6)
Amortization of the Remeasurement of Deferred Income Taxes0.3 
Equity Investment Balance as of March 31, 2024$182.7 
We account for our investment in Nobles 2 under the equity method of accounting.
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2023$151.5 
Equity in Nobles 2 Earnings (a)
(0.2)
Distributed Nobles 2 Earnings(0.9)
Equity Investment Balance as of March 31, 2024$150.4 
(a)The Company also recorded earnings from net loss attributable to non-controlling interest of $3.0 million related to its investment in Nobles 2.