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Condensed Financial Information of Registrant (Parent Company) (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Additional condensed financial information of registrant (Textual) [Abstract]      
Dividend received from unconsolidated subsidiaries $ 156.0 $ 188.9 $ 172.8
Parent Company [Member]
     
Additional condensed financial information of registrant (Textual) [Abstract]      
Surety bonds indemnified 42.7    
Maximum amount authorized to guarantee obligations to suppliers and customers 425.0    
Current carrying value 347.6    
Flaga [Member]
     
Additional condensed financial information of registrant (Textual) [Abstract]      
Amount of floating to fixed rate interest rate swaps at Flaga $ 5.6