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Condensed Financial Information of Registrant (Parent Company) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Guarantee Obligations      
Dividend received from unconsolidated subsidiaries $ 186.4 $ 155.2 $ 156.0
Parent Company
     
Guarantee Obligations      
Surety bonds indemnified 65.1    
Maximum amount authorized to guarantee obligations to suppliers and customers 500.0    
Current carrying value 414.1    
Flaga
     
Guarantee Obligations      
Amount of floating to fixed rate interest rate swaps at Flaga $ 3.5