Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	$ 750	$ 0
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income	(31.1)	0
Amount of derivative (gains)/losses pertaining to hedging instruments that is expected to be reclassified into earnings within twelve months	(2.0)
Foreign Exchange [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	393	383
Foreign Exchange [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income	(3.3)	2.9
Amount of derivative (gains)/losses pertaining to hedging instruments that is expected to be reclassified into earnings within twelve months	(2.5)
Outstanding contracts expire (in months)	23 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	12.0	33.6
Outstanding contracts expire (in months)	32 months
Coffee [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	3	125
Coffee [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Net derivative (gains)/losses, net of taxes, included in accumulated other comprehensive income	30.0	32.9
Amount of derivative (gains)/losses pertaining to hedging instruments that is expected to be reclassified into earnings within twelve months	$ 29.0
Outstanding contracts expire (in months)	9 months