Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Foreign Exchange [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income related to cash flow hedges	$ (1.0)	$ 2.9
Amount of derivative (gains)/losses pertaining to hedging instruments that will be dedesignated within twelve months, foreign currency	(1.0)
Outstanding contracts expire (in months)	11 months
Foreign Exchange [Member] | Net Investment Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income related to net investment hedges	16.9	33.6
Outstanding contracts expire (in months)	35 months
Coffee [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income related to cash flow hedges	42.6	32.9
Amount of derivative (gains)/losses pertaining to hedging instruments that will be dedesignated within twelve months, coffee	$ 41.9
Outstanding contracts expire (in months)	12 months