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Other Expense
12 Months Ended
Sep. 30, 2011
Other Expense [Abstract] 
Other Expense
15. Other Expense
The components of other expense are (in millions):
                         
    2011     2010     2009  
Net gain (loss) on dispositions of securities and property
  $ 0.9     $ (5.5 )   $ (4.4 )
Interest income
    6.0       5.0       9.6  
Royalty income
    3.6       2.4       3.7  
Environmental charges
    (4.5 )     (5.9 )     (4.5 )
Other
    (8.1 )     (4.4 )     (11.1 )
 
                 
Other expense
  $ (2.1 )   $ (8.4 )   $ (6.7 )