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Taxes on Income - Reconciliation of the Amount of Tax Expense at the Federal Statutory Rate and Taxes on Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Federal taxes at statutory rate $ 165.2 $ 172.9 $ 281.0
Federal statutory rate 21.00% 21.00% 21.00%
State taxes, net of federal tax effect $ 25.5 $ 42.8 $ 71.3
State taxes, net of federal tax effect rate 3.20% 5.20% 5.30%
Tax reserve release on audit settlement, net of valuation allowance $ (4.8) $ 0.5 $ (11.4)
Tax reserve release on audit settlement, net of valuation allowance rate (0.60%) 0.10% (0.90%)
Effect of net income attributable to noncontrolling interests $ (5.0) $ (29.7) $ (22.0)
Effect of net income attributable to noncontrolling interest rate (0.60%) (3.60%) (1.60%)
Effect of non-U.S. operations $ 44.5 $ 4.0 $ (14.7)
Effect of non-U.S. operation rate 5.70% 0.50% (1.10%)
Capital loss on investment, net of valuation allowance $ 7.5 $ 7.4 $ (8.8)
Capital loss on investment, net of valuation allowance rate 1.00% 0.90% (0.70%)
Effective Income Tax Rate Reconciliation, Foreign tax credit valuation allowance release $ (12.6) $ 5.1 $ 7.2
Effective Income Tax Rate Reconciliation, Foreign tax credit valuation allowance release Percent (1.60%) 0.60% 0.50%
Other $ 17.6 $ 12.3 $ 9.7
Other rate 2.20% 1.50% 0.80%
Tax Provision $ 237.9 $ 215.3 $ 312.3
Effective Tax Rate 30.20% 26.20% 23.30%