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Commitments and Contingencies (Piedmont) (Narrative) (Details) (Piedmont, Florida [Member], USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2015
|
Sep. 30, 2008
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| Loss Contingencies [Line Items] | ||
| Accrual for environmental loss contingencies | $ 18.4 | $ 24.0 |
| Years to complete environmental remediation (beginning in 2017) | 15 years | |
| Change in estimated exposure | 0 | |
| Total anticipated exposure at this site | 24 | |
| Segment Discontinued Operations Member | ||
| Loss Contingencies [Line Items] | ||
| Pretax environmental expense | $ 24 |