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Discontinued Operations, Goodwill, and Intangible Assets - Statement of cash flows (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Held for sale      
Discontinued Operations, Goodwill and Intangible Assets      
Payments for capital expenditures $ (6.2) $ (2.7) $ (7.3)