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Debt (Related Party Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Related Party Transaction [Line Items]    
Current portion of long-term debt $ 990.9 $ 615.0
Related Party    
Related Party Transaction [Line Items]    
Total debt 289.5 328.3
Current portion of long-term debt $ 193.2 $ 177.6