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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Income Tax Disclosure [Abstract]        
Current income tax expense $ 2.1 $ 3.4 $ 5.2 $ 6.3
Effective income tax rate 21.80% 23.40% 22.40% 22.60%