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Commitments and Contingencies (Pace, Piedmont, Pasadena Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2012
Sep. 30, 2008
Sep. 30, 2006
Loss Contingencies [Line Items]            
Pretax environmental expense $ 11,400,000 $ 12,200,000 $ 11,800,000      
Pace, Florida            
Loss Contingencies [Line Items]            
Accrual for environmental loss contingencies 28,900,000         $ 42,000,000
Change in estimated exposure 0          
Pace, Florida | Discontinued Operations            
Loss Contingencies [Line Items]            
Pretax environmental expense           42,000,000
Pace, Florida | Minimum            
Loss Contingencies [Line Items]            
Estimate of possible exposure from environment loss contingencies           42,000,000
Pace, Florida | Maximum            
Loss Contingencies [Line Items]            
Estimate of possible exposure from environment loss contingencies           $ 52,000,000
Piedmont, South Carolina            
Loss Contingencies [Line Items]            
Accrual for environmental loss contingencies 16,700,000       $ 24,000,000  
Piedmont, South Carolina | Discontinued Operations            
Loss Contingencies [Line Items]            
Pretax environmental expense         $ 24,000,000  
Pasadena, Texas            
Loss Contingencies [Line Items]            
Accrual for environmental loss contingencies $ 12,100,000          
Total anticipated exposure       $ 13,000,000