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Other Income (Expense) (Tables)
 12 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Components of other income (expense)
The components of other income (expense) are (in millions):
 
 
2018
 
2017
 
2016
Gain on sale of business
 
$
—

 
$
60.8

 
$
—

Change in fair value of investments
 
90.0

 
—

 
—

Interest income
 
24.4

 
19.6

 
12.7

Royalty income
 
9.7

 
8.9

 
2.9

Legacy product liability and environmental benefit (charges)
 
2.6

 
(8.3
)
 
(12.7
)
Other
 
3.9

 
(0.1
)
 
3.4

Other income (expense)
 
$
130.6

 
$
80.9

 
$
6.3