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Commitments and Contingencies (Litigation and Environmental - Narrative) (Details)
R$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2010
BRL (R$)
Jun. 30, 2018
USD ($)
site
Jun. 30, 2018
BRL (R$)
site
Sep. 30, 2017
USD ($)
Alleged Anticompete Litigation        
Loss Contingencies [Line Items]        
Civil fines imposed R$ 179.2 $ 46,000,000    
Provision for litigation   0    
Maximum of loss contingency range subject to interest   $ 46,000,000 R$ 179.2  
Environmental        
Loss Contingencies [Line Items]        
Approximate number of sites on which settlement has not been reached | site   34 34  
Accrual for environmental loss contingencies   $ 78,400,000   $ 83,600,000
Accrual for environmental loss contingencies, maximum payout period   30 years    
Environmental | Minimum        
Loss Contingencies [Line Items]        
Estimate of possible exposure from environmental loss contingencies   $ 78,000,000    
Environmental | Maximum        
Loss Contingencies [Line Items]        
Estimate of possible exposure from environmental loss contingencies   $ 92,000,000