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Other Income (Expense) (Tables)
 12 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Components of Other Income (Expense)
The components of other income (expense) are (in millions):
 
 
2019
 
2018
 
2017
Gain on sale of business
 
$
—

 
$
—

 
$
60.8

Change in fair value of investments
 
(368.5
)
 
90.0

 
—

Interest income
 
11.1

 
24.4

 
19.6

Royalty income
 
10.2

 
9.7

 
8.9

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

 
(8.3
)
Non-operating pension and postretirement benefit credit (cost)
 
8.4

 
(23.8
)
 
(77.6
)
Other
 
(1.5
)
 
3.9

 
(0.1
)
Other income (expense)
 
$
(362.4
)
 
$
106.8

 
$
3.3