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Commitments and Contingencies (Tables)
12 Months Ended
Sep. 30, 2011
Commitments and Contingencies [Abstract] 
Changes in warranty liability
 
                 
    September 30,  
    2011     2010  
    (In millions)  
 
Warranty liability, beginning of year
  $ 46.2     $ 59.6  
Warranties issued
    15.8       19.5  
Changes in liability for pre-existing warranties
    11.5       (5.0 )
Settlements made
    (27.3 )     (27.9 )
                 
Warranty liability, end of year
  $ 46.2     $ 46.2  
                 
Minimum annual lease payments
 
         
2012
  $ 13.3  
2013
    8.4  
2014
    5.8  
2015
    2.5  
2016
    —  
Thereafter
    —  
         
    $ 30.0