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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
6 Months Ended
Mar. 31, 2025
USD ($)
Segment
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Accounting Policies [Line Items]      
Number of reportable segments | Segment 3    
Restricted cash $ 30.8 $ 30.4 $ 20.8
MoGas Pipeline [Member]      
Accounting Policies [Line Items]      
Payments to acquire businesses, gross 176.1    
Other Income [Member]      
Accounting Policies [Line Items]      
Gain on discontinuation of cash flow hdge due to forecasted transaction probable of not occurring $ 8.2