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Variable Interest Entities - JIGPC Joint Venture (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Sep. 30, 2024
Sep. 30, 2023
Jazan Integrated Gasification and Power Company ("JIGPC")      
Variable Interest Entity [Line Items]      
Ownership interest (percent) in former equity method investment 55.00% 55.00%  
Investment balance   $ 2,871.2 $ 2,862.2
Jazan Integrated Gasification and Power Company ("JIGPC") | Non-controlling Interests      
Variable Interest Entity [Line Items]      
Ownership percentage attributable to noncontrolling partner 4.00% 4.00%  
Aramco | Jazan Integrated Gasification and Power Company ("JIGPC")      
Variable Interest Entity [Line Items]      
Term of project agreement 25 years