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Commitments and Contingencies (Piedmont) (Narrative) (Details) (Piedmont, Florida [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2008
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 19.0 $ 24.0
Estimated years to complete environmental remediation (beginning in 2017)   15 years
Change in estimated exposure 0  
Total anticipated exposure at this site   24.0
Segment Discontinued Operations [Member]
   
Loss Contingencies [Line Items]    
Pretax environmental expense   $ 24.0