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Debt - Effective Interest Rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Debt Disclosure [Abstract]        
Effective interest rate (as percent) 5.10% 5.50% 5.10% 5.50%
Amortization of deferred debt issuance costs $ 1.2 $ 1.2 $ 2.6 $ 2.4