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Business Segment and Geographic Information (Reconciliation of Equity Affiliates' Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Equity affiliates' income $ 647.7 $ 604.3 $ 481.5
Equity method investment impairment charge     (14.8)
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Equity method investment impairment charge 0.0 0.0 (14.8)
Segment Total      
Segment Reporting Information [Line Items]      
Equity affiliates' income $ 647.7 $ 604.3 $ 496.3