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Other (Expense) Income
 12 Months Ended
Sep. 30, 2022
Other Income and Expenses [Abstract]  
Other (Expense) Income Other (Expense) Income
The components of Other (expense) income were (in millions):
202220212020
Interest income$4.4 $1.6 $5.5 
Royalty income10.9 10.2 8.9 
Legacy product liability and environmental charges(15.6)(10.6)(14.5)
Non-operating pension and postretirement benefit cost(4.7)(63.8)(37.4)
Legal settlement (Note 17)— 70.0 — 
Other3.4 (1.7)7.8 
Other (expense) income$(1.6)$5.7 $(29.7)