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Other (Expense) Income (Tables)
 12 Months Ended
Sep. 30, 2020
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
The components of other (expense) income are (in millions):
 
 
2020
 
2019
 
2018
Interest income
 
$
5.5

 
$
11.1

 
$
24.4

Royalty income
 
8.9

 
10.2

 
9.7

Legacy product liability and environmental (charges) benefit
 
(14.5
)
 
(22.1
)
 
2.6

Non-operating pension and postretirement benefit (cost) credit
 
(37.4
)
 
8.4

 
(23.8
)
Other
 
7.8

 
(1.5
)
 
3.9

Other (expense) income
 
$
(29.7
)
 
$
6.1

 
$
16.8