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Commitments and Contingencies (Pace, Piedmont, Pasadena Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2012
Sep. 30, 2008
Sep. 30, 2006
Pace, Florida        
Loss Contingencies [Line Items]        
Accrual for environmental loss contingencies $ 28,200,000     $ 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 environmental loss contingencies       42,000,000
Pace, Florida | Maximum        
Loss Contingencies [Line Items]        
Estimate of possible exposure from environmental loss contingencies       $ 52,000,000
Piedmont, South Carolina        
Loss Contingencies [Line Items]        
Accrual for environmental loss contingencies 16,200,000   $ 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 $ 11,900,000      
Total anticipated exposure   $ 13,000,000