Commitments and Contingencies (Litigation and Environmental) (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended
	Sep. 30, 2012 Environmental [Member] USD ($) yr	Sep. 30, 2011 Environmental [Member] USD ($)	Sep. 30, 2010 Alleged Anticompete Litigation [Member] USD ($)	Sep. 30, 2012 Alleged Anticompete Litigation [Member] USD ($)	Sep. 30, 2010 Alleged Anticompete Litigation [Member] BRL	Sep. 30, 2012 Alleged Anticompete Litigation [Member] BRL
Loss Contingencies [Line Items]
Civil fines imposed			$ 88.0		179.2
Provision for litigation				0
Maximum of loss contingency range subject to interest				88.0		179.2
Accrual for environmental loss contingencies	87.5	82.3
Approximate number of sites on which settlement has not been reached	35
Accrual for environmental loss contingencies, Maximum payout period, years	30
Accrual for environmental loss contingencies, Minimum exposure	87
Accrual for environmental loss contingencies, Maximum exposure	$ 101