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Debt - Credit Agreement - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Jan. 31, 2023
Debt Instrument [Line Items]
Amount borrowed from credit facility foreign subsidiary	$ 46.3		$ 46.3
Interest expense	$ 15.3	$ 19.6	$ 32.6	$ 41.7
Interest rate during period	4.70%	4.90%	4.70%	4.80%
Line of Credit
Debt Instrument [Line Items]
Unused commitments under revolving credit facility	$ 1,006.3		$ 1,006.3
Amounts available for borrowing	$ 989.2		$ 989.2
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	5.10%		5.10%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility amount					$ 1,250.0

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