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Other Income (Expense)
 12 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense)
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


In September 2017, we sold W Interconnections, Inc. and subsidiaries, which was included within our Control Products & Solutions segment, for approximately $94.0 million. We recorded a pre-tax gain of $60.8 million as a result of this divestiture, which is included within Other income (expense) in the Consolidated Statement of Operations. The change in fair value of investments includes the gain on investments and valuation adjustment pending registration of PTC Shares. Additional information related to our investments is included in Note 8.