Debt - Credit Agreement - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 31, 2023
Debt Instrument [Line Items]
Amount borrowed from credit facility foreign subsidiary	$ 0.0
Interest expense	$ 22.0	$ 35.3
Interest rate during period	4.70%	5.70%
Line of Credit
Debt Instrument [Line Items]
Unused commitments under credit facility	$ 1,190.0
Amounts available for borrowing	$ 1,174.5
Line of Credit | Minimum
Debt Instrument [Line Items]
Credit facility commitment fees percentage	0.175%
Line of Credit | Maximum
Debt Instrument [Line Items]
Credit facility commitment fees percentage	0.325%
Secured Debt
Debt Instrument [Line Items]
Credit facility amount			$ 500.0
Annual rate for borrowings outstanding	5.90%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility amount			$ 1,250.0