Financial Instruments (Schedule of Outstanding Currency Price Risk Management Instruments) (Details) - Forward Exchange Contracts [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015
Derivative [Line Items]
US$ Notional	$ 6,104.3	$ 5,898.4
Years Average Maturity	10 months	11 months
Cash Flow Hedges [Member]
Derivative [Line Items]
US$ Notional	$ 4,801.6	$ 4,543.8
Years Average Maturity	7 months	6 months
Net Investment Hedges [Member]
Derivative [Line Items]
US$ Notional	$ 447.1	$ 491.3
Years Average Maturity	3 years 11 months	4 years
Hedges Not Designated [Member]
Derivative [Line Items]
US$ Notional	$ 855.6	$ 863.3
Years Average Maturity	7 months	8 months