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Supplemental Information (Narrative) (Details) (USD $)
In Millions, except Per Share data
3 Months Ended12 Months Ended1 Months Ended3 Months Ended
Jun. 30, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Apr. 30, 2010
Allowance for Certain Notes Receivable [Member]
Jun. 30, 2009
Allowance for Certain Notes Receivable [Member]
Write-off of certain receivables, pre-tax $ 23.4$ 29.5$ 37.8 $ 22.2
Write-off of certain receivables, after-tax     13.9
Write-off of certain receivables, per share     $ 0.07
Final settlement received    22.4 
Recovery of certain receivables    16.0 
Income from previous written off receivables, pre-tax    6.4 
Income from previous written off receivables, after-tax    4.0 
Income from previous written off receivables, per share    $ 0.02 
Facility closing costs9.9     
Facility closing costs, after-tax$ 7.1     
Facility closing costs, per share$ 0.03