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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]          
Customer rebate liability $ 143.9   $ 143.9   $ 149.6
Rebates recorded $ 143.0 $ 124.5 $ 436.3 $ 389.7