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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - net $ 19.0 $ 18.3
Goodwill 15.7 15.6
Total Goodwill and Other Intangible Assets 34.7 33.9
Patents    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - gross 22.6 21.2
Amortized intangible assets - accumulated amortization (7.3) (6.9)
Amortized intangible assets - net 15.3 14.3
Customer Relationship and Other    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets - gross 5.3 5.4
Amortized intangible assets - accumulated amortization (1.6) (1.4)
Amortized intangible assets - net $ 3.7 $ 4.0