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Acquisitions - JBR Recovery Limited - Narrative (Details) $ in Millions	Oct. 01, 2024 USD ($) payment	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Business Combination [Line Items]
Purchase price allocated to goodwill		$ 298.3	$ 61.0
JBR
Business Combination [Line Items]
Purchase price	$ 8.0
Silver bullion paid	12.6
Silver bullion payable	0.7
Holdback amount	$ 2.4
Deferred consideration, number of payments | payment	2
Purchase price allocated to goodwill	$ 4.8
Total fair value of intangible assets acquired	$ 2.5

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