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Debt (Summary of Outstanding Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Debt Disclosure [Abstract]    
Short-term borrowings $ 144.0 $ 935.8
Current portion of long-term debt 416.4 365.4
Long-term debt 3,402.4 3,909.7
Total Debt $ 3,962.8 $ 5,210.9