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Commitments (Details Textual) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended
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May 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 04, 2012 | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Maximum [Member] | Jan. 04, 2011 Circuit Court of Cook County [Member] Plaintiffs | Sep. 30, 2012 Court of Common Pleas, Philadelphia County [Member] | Jan. 04, 2011 Court of Common Pleas, Philadelphia County [Member] Plaintiffs | Sep. 30, 2012 Settlement Agreement [Member] Plaintiffs | Apr. 29, 2011 Settlement Agreement [Member] | Apr. 22, 2011 Settlement Agreement [Member] | Sep. 30, 2012 1999-2004 [Member] Circuit Court of Cook County [Member] Case Plaintiffs | Sep. 30, 2012 2009 [Member] Circuit Court of Cook County [Member] Case | Sep. 30, 2012 2008 [Member] Circuit Court of Cook County [Member] Plaintiffs | Sep. 30, 2012 2007-2009 [Member] Court of Common Pleas, Philadelphia County [Member] Plaintiffs Case | Sep. 30, 2012 Outside Chicago firefighter plaintiffs [Member] 1999-2004 [Member] Circuit Court of Cook County [Member] Plaintiffs | Sep. 30, 2012 Pennsylvania firefighter plaintiffs [Member] 2009 [Member] Circuit Court of Cook County [Member] Plaintiffs | Sep. 30, 2012 Chicago firefighter plaintiffs [Member] Minimum [Member] Plaintiffs | Sep. 30, 2012 Chicago firefighter plaintiffs [Member] Maximum [Member] Plaintiffs | Sep. 30, 2012 Chicago firefighter plaintiffs [Member] 2009 [Member] Circuit Court of Cook County [Member] Case Plaintiffs | Sep. 30, 2012 Chicago firefighter plaintiffs [Member] November, 2011 [Member] Circuit Court of Cook County [Member] Plaintiffs | Sep. 30, 2012 Philadelphia firefighter plaintiffs [Member] Court of Common Pleas, Philadelphia County [Member] Plaintiffs Case | Sep. 30, 2012 Philadelphia firefighter plaintiffs [Member] 2010 [Member] Court of Common Pleas, Philadelphia County [Member] Plaintiffs
Commitments (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty Maturity Periods |  |  |  |  | 1 year | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  |  |  |  |  |  |  |  | 33 | 6 |  | 71 |  |  |  |  | 40 |  | 15 |
Number of plaintiffs |  |  |  |  |  |  |  |  |  | 1,069 |  |  | 2,443 |  |  | 71 | 1,800 | 299 | 9 | 40 |  |  | 15 | 9
Plaintiff's counsel later moved to reduce the number of plaintiff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |
Number of cases of plaintiff's claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  |  | 8 |  |
Claims settled amount |  |  |  |  |  |  |  |  |  | $ 3.8 |  |  |  |  |  |  |  |  |  |  | $ 0.4 |  |  |
Percentage of claimants agreed for settlement |  |  |  |  |  |  |  |  |  |  | 93.00% | 95.02% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of claimants agreed for settlement as per settlement agreement |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Plaintiffs, dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Damages maximum amount |  |  |  |  |  |  |  | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount |  |  |  |  |  |  |  | 0.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  | 308 |  | 1,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement Agreement payment made |  |  |  |  |  |  |  |  |  |  |  | 3.6 |  |  |  |  |  |  |  |  |  |  |  |
Commitments (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding standby letters of credit |  | 31.3 | 34.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves related to environmental remediation |  | 1.9 | 2.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of Pearland | 0.9 | 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain | 0.4 | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement received |  | $ 0.4 | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding period purchase proceed held as security |  |  |  | 48 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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