Special Purpose Entities - Summary of Restricted Assets and Non-recourse Liabilities (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Special Purpose Entities [Abstract]
Interest income on Timber Notes	[1]	$ 12.3	$ 13.1
Interest expense on Timber Loans	[1]	10.6	11.7
Cash receipts on Timber Notes	[2]	32.2	24.9
Cash payments on Timber Loans	[2]	$ 28.6	$ 23.4

[1] Presented in Interest expense, net on the accompanying Consolidated Statements of Operations.

[2] Included as part of operating cash flows on the accompanying Consolidated Statements of Cash Flows.