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Equity Method Investments
 9 Months Ended
Sep. 30, 2024
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity Method Investments Equity Method Investments
The Company’s equity method investments include its interests in Middlemount Coal Pty Ltd (Middlemount), R3 Renewables LLC (R3) and certain other equity method investments.
The table below summarizes the book value of those investments, which are reported in “Investments and other assets” in the condensed consolidated balance sheets, and the related “Loss (income) from equity affiliates”:
Loss (Income) from Equity Affiliates
Book Value atThree Months Ended September 30,Nine Months Ended September 30,
September 30, 2024December 31, 20232024202320242023
(Dollars in millions)
Equity method investment related to Middlemount$47.3 $42.5 $(2.2)$(8.2)$(4.1)$(14.9)
Equity method investment related to R36.6 7.1 4.3 2.6 11.2 5.2 
Total equity method investments$53.9 $49.6 $2.1 $(5.6)$7.1 $(9.7)
R3
The Company contributed $10.8 million and $5.5 million to R3 during the nine months ended September 30, 2024 and 2023, respectively.