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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - net $ 7.3 $ 8.1
Goodwill 15.4 15.6
Total Goodwill and Other Intangible Assets 22.7 23.7
Patents    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - gross 10.8 10.8
Amortized intangible assets - accumulated amortization (5.5) (5.1)
Amortized intangible assets - net 5.3 5.7
Customer Relationship and Other    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - gross 5.3 5.2
Amortized intangible assets - accumulated amortization (3.3) (2.8)
Amortized intangible assets - net $ 2.0 $ 2.4