Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 126.4	$ 197.8	$ 163.1
Additions for tax positions of the current year	44.5	16.3	31.8
Additions for tax positions of prior years	2.3	5.7	12.9
Reductions for tax positions of prior years	(46.9)	(72.4)	(1.0)
Settlements	(11.0)	(15.6)	0
Statute of limitations expiration	(3.7)	(4.8)	(6.1)
Foreign currency translation	(0.8)	(0.6)	(2.9)
Balance at End of Year	$ 110.8	$ 126.4	$ 197.8