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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Disclosure [Abstract]        
Current income tax expense $ 2.3 $ 3.8 $ 7.4 $ 10.1
Effective income tax rate 20.10% 21.30% 21.60% 22.10%