Debt - Schedule of Debt (Tables)

12 Months Ended

Sep. 30, 2025

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The Company's notes payable at their carrying amounts consist of the following:

	September 30,
	2025		2024
	(In millions)
Unsecured:
Revolving credit facility	$	—	$	—
3.85% senior notes due 2026 (1)	—		398.4
5.0% senior notes due 2028 (1)	298.7		298.1
6.5% senior notes due 2033 (1)	494.1		—
Other note payable	9.9		9.9
	$	802.7	$	706.4

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(1)Unamortized debt issuance costs that were deducted from the carrying amounts of the senior notes totaled $7.2 million and $3.5 million at September 30, 2025 and 2024, respectively.