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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
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