Commitments and Contingencies (Litigation and Environmental) (Narrative) (Details) BRL in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2010 BRL	Sep. 30, 2015 USD ($)	Sep. 30, 2015 BRL Sites	Sep. 30, 2015 USD ($) Sites	Sep. 30, 2014 USD ($)
Environmental [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies				$ 80.6	$ 86.2
Approximate number of sites on which settlement has not been reached | Sites			37	37
Accrual for environmental loss contingencies, Minimum exposure				$ 80.0
Accrual for environmental loss contingencies, Maximum exposure				93.0
Alleged Anticompete Litigation [Member]
Loss Contingencies [Line Items]
Civil fines imposed	BRL 179.2	$ 45.0
Provision for litigation		$ 0.0
Maximum of loss contingency range subject to interest			BRL 179.2	$ 45.0