Financial Instruments (Schedule of Outstanding Currency Price Risk Management Instruments) (Details) (Forward Exchange Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013
Derivative [Line Items]
US$ Notional	$ 3,680.7	$ 4,637.1
Years Average Maturity	1 year 1 month	1 year
Cash Flow Hedges [Member]
Derivative [Line Items]
US$ Notional	2,619.0	2,653.4
Years Average Maturity	6 months	7 months
Net Investment Hedges [Member]
Derivative [Line Items]
US$ Notional	752.2	1,231.8
Years Average Maturity	3 years 7 months	2 years 5 months
Hedges Not Designated [Member]
Derivative [Line Items]
US$ Notional	$ 309.5	$ 751.9
Years Average Maturity	1 month	1 month