Derivative Financial Instruments And Hedging (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, liability	$ 12.8		$ 12.8		$ 34.3
Accumulated other comprehensive loss on cash flow hedging instruments after taxes	16.4		16.4		21.3
Accumulated other comprehensive loss on cash flow hedging instruments before taxes	26.5		26.5		33.7
Cash flow hedge gain (loss) to be reclassified within twelve months			9.5
Derivative instruments, liability position	9.9		9.9		3.9
Derivative instruments, related collateral	0.7		0.7		8.2
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative financial instruments, term	ten years		ten years
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative financial instruments, term	two years		two years
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative financial instruments, term	eighteen months		eighteen months
Segment Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	0.2	(0.7)	(2.0)	0.1
Derivative instruments, net liability					$ 10.3