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Supplemental Information (Uzbekistan Asset Purchase) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 25, 2023
Mar. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Asset Acquisition [Line Items]          
Financing receivables   $ 1,209.6 $ 1,209.6   $ 817.2
Financing receivables progress payments     392.4 $ 0.0  
Natural Gas-To-Syngas Processing Facility          
Asset Acquisition [Line Items]          
Price of acquisition $ 1,000.0        
Term of project agreement (in years) 15 years        
Financing receivables   910.0 $ 910.0    
Financing receivables progress payments   $ 100.0