Goodwill and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Total amortized intangible assets	$ 7.0	$ 8.1
Goodwill	15.4	15.6
Total Goodwill and Other Intangible Assets	$ 22.4	23.7
Patents – net
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	10 years 7 months 6 days
Amortized intangible assets - gross	$ 10.8	10.8
Amortized intangible assets - Less: accumulated amortization	(5.7)	(5.1)
Total amortized intangible assets	$ 5.1	5.7
Customer Relationships and Other – net
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	3 years 9 months 18 days
Amortized intangible assets - gross	$ 5.3	5.2
Amortized intangible assets - Less: accumulated amortization	(3.4)	(2.8)
Total amortized intangible assets	$ 1.9	$ 2.4