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Other Expense (Tables)
 12 Months Ended
Sep. 30, 2012
Other Income and Expenses [Abstract]  
Components of other expense
The components of other expense are (in millions):
 
 
2012
 
2011
 
2010
Net gain (loss) on dispositions of securities and property
 
$
(1.0
)
 
$
0.9

 
$
(5.5
)
Interest income
 
7.8

 
6.0

 
5.0

Royalty income
 
2.3

 
3.6

 
2.4

Environmental charges
 
(9.3
)
 
(4.5
)
 
(5.9
)
Other
 
(4.8
)
 
(8.1
)
 
(4.4
)
Other expense
 
$
(5.0
)
 
$
(2.1
)
 
$
(8.4
)