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Other (Expense) Income (Tables)
 12 Months Ended
Sep. 30, 2015
Other Income and Expenses [Abstract]  
Components of other (expense) income
The components of other (expense) income are (in millions):
 
 
2015
 
2014
 
2013
Net gain (loss) on disposition of property
 
$
0.1

 
$
(0.6
)
 
$
(0.5
)
Interest income
 
10.7

 
9.5

 
9.8

Royalty income
 
2.9

 
2.5

 
3.3

Legacy product liability and environmental charges
 
(19.8
)
 
(14.6
)
 
(24.9
)
Other
 
0.6

 
12.9

 
18.0

Other (expense) income
 
$
(5.5
)
 
$
9.7

 
$
5.7