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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 |  |

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