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Commitments and Contingencies (Piedmont) (Narrative) (Details) - Piedmont, Florida [Member] - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2008
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 18.0 $ 24.0
Years to complete environmental remediation until 2019 to complete source area remediation with groundwater recovery and treatment, continuing through 2029  
Change in estimated exposure $ 0.0  
Segment Discontinued Operations Member    
Loss Contingencies [Line Items]    
Pretax environmental expense   $ 24.0