Commitments and Contingencies (Litigation and Environmental) (Narrative) (Details) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended		9 Months Ended
	Jun. 30, 2012 Environmental [Member] USD ($) yr	Sep. 30, 2011 Environmental [Member] USD ($)	Sep. 30, 2010 Brazil Alleged Anticompete Litigation [Member] USD ($)	Sep. 30, 2010 Brazil Alleged Anticompete Litigation [Member] BRL	Jun. 30, 2012 Brazil Alleged Anticompete Litigation [Member] USD ($)	Jun. 30, 2012 Brazil Alleged Anticompete Litigation [Member] BRL
Loss Contingencies [Line Items]
Civil fines imposed			$ 89.0	179.2
Provision for litigation					0
Maximum of loss contingency range subject to interest					89.0	179.2
Accrual for environmental loss contingencies	79.2	82.3
Approximate number of sites on which settlement has not been reached	3
Accrual for environmental loss contingencies, Maximum payout period, years	30
Accrual for environmental loss contingencies, Minimum exposure	79
Accrual for environmental loss contingencies, Maximum exposure	$ 93