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Other Income (Expense), Net (Tables)
12 Months Ended
Sep. 30, 2022
Other Nonoperating Income (Expense) [Abstract]  
Other Income (Expense), Net
 Year Ended September 30,
 202220212020
Interest income$5.5 $3.4 $3.2 
Foreign currency exchange gain, net0.2 0.1 1.2 
Other, net2.7 (3.2)(0.4)
Other income, net$8.4 $0.3 $4.0