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Income Taxes - Schedule of Components of Income Tax Expense/(Benefit) Attributable to Income from Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current taxes:      
U.S. federal $ 37.2 $ 26.4 $ 15.8
U.S. state and local 7.0 5.9 3.9
Total current taxes 95.6 103.8 86.9
Deferred taxes:      
U.S. federal (2.0) 1.7 (1.1)
U.S. state and local (1.0) 0.5 0.0
Total deferred taxes 7.3 (10.5) (2.4)
Income tax expense 102.9 93.3 84.5
Brazil      
Current taxes:      
Foreign tax expense 19.7 18.2 16.0
Deferred taxes:      
Other international 1.2 (3.6) 0.0
Germany      
Current taxes:      
Foreign tax expense 3.4 4.2 4.5
Deferred taxes:      
Other international 0.0 (0.4) 0.0
Singapore      
Current taxes:      
Foreign tax expense 9.4 7.7 4.9
United Kingdom      
Current taxes:      
Foreign tax expense 9.5 34.5 30.9
Deferred taxes:      
Other international 10.5 (7.2) (1.4)
Other international      
Current taxes:      
Foreign tax expense 9.4 6.9 10.9
Deferred taxes:      
Other international $ (1.4) $ (1.5) $ 0.1