Supporting Financial Information - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amortization expense of intangible assets	$ 4.1	$ 4.1	$ 8.2	$ 8.2
Depreciation	$ 0.2	$ 0.2	$ 0.4	$ 0.3