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Commitments and Contingencies Commitments and Contingencies - Reserves for Legal Claims (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Rollforward of reserves for legal claims    
Reserves for legal claims, beginning of period $ 729.1 $ 577.5
Change in reserves 179.9 186.1
Payments (50.1) (34.5)
Reserves for legal claims, end of period $ 858.9 $ 729.1