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Goodwill and Other Intangible Assets
 6 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets consisted of:
March 31, 2022 September 30, 2021
Amortized intangible assets
Patents – gross$22.6 $21.2 
Less: accumulated amortization(7.3)(6.9)
Patents – net$15.3 $14.3 
Customer Relationships and Other – gross$5.3 $5.4 
Less: accumulated amortization(1.6)(1.4)
Customer Relationships and Other – net$3.7 $4.0 
Total amortized intangible assets$19.0 $18.3 
Goodwill15.7 15.6 
Total Goodwill and Other Intangible Assets$34.7 $33.9 
Intangible asset amortization expense was $0.3 million and $0.5 million for the three months ended March 31, 2022 and 2021, respectively, and $0.3 million and $0.5 million for the six months ended March 31, 2022 and 2021, respectively.