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Equity Investments (Tables)
9 Months Ended
Sep. 30, 2023
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, 2022$165.4 
Cash Investments6.6 
Equity in ATC Earnings17.3 
Distributed ATC Earnings(13.8)
Amortization of the Remeasurement of Deferred Income Taxes1.0 
Equity Investment Balance as of September 30, 2023$176.5 
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, 2022$157.3 
Equity in Nobles 2 Earnings (a)
(1.2)
Distributed Nobles 2 Earnings(2.9)
Equity Investment Balance as of September 30, 2023$153.2 
(a)The Company also recorded earnings from net loss attributable to non-controlling interest of $7.2 million related to its investment in Nobles 2.