Financial Instruments (Schedule of Outstanding Currency Price Risk Management Instruments) (Details) - Forward Exchange Contracts [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015
Derivative [Line Items]
US$ Notional	$ 6,500.2	$ 5,898.4
Years Average Maturity	8 months	11 months
Cash Flow Hedges [Member]
Derivative [Line Items]
US$ Notional	$ 5,051.6	$ 4,543.8
Years Average Maturity	6 months	6 months
Net Investment Hedges [Member]
Derivative [Line Items]
US$ Notional	$ 442.0	$ 491.3
Years Average Maturity	3 years 10 months	4 years
Hedges Not Designated [Member]
Derivative [Line Items]
US$ Notional	$ 1,006.6	$ 863.3
Years Average Maturity	6 months	8 months