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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Income tax expense $ 13.0 $ 7.1  
Effective Income Tax Rate Reconciliation, Percent 25.40% 25.40%  
Deferred Tax Liabilities, Gross $ 49.3   $ 49.8
Deferred Tax Assets, Valuation Allowance 0.9   0.9
Deferred tax liability, net $ 50.2   $ 50.7