Debt (Short-term Borrowings) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Short-term Debt [Abstract]
Bank obligations	$ 234.3	$ 320.7
Commercial paper	1,260.0	908.0
Total Short-term Borrowings	$ 1,494.3	$ 1,228.7