Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
|---|---|
Sep. 30, 2011 | |
New Jersey Chrome Sites [Member] | |
| Environmental Matters Paragraph Details [Abstract] | |
| Study area 7 chromium residue | one million tons |
| Site Contingency Number Of Aco Sites | 21 |
| Third party past costs | $ 5 |
| Publicly funded sites, fully responsible | 24 |
| Publicly funded sites, total | 53 |
| Partially responsible sites, percent | 50.00% |
| Number of sites, partially responsible | 10 |
Dundalk Marine Terminal [Member] | |
| Environmental Matters Paragraph Details [Abstract] | |
| Cost of developing and implementing permanent remedy percent | 77.00% |