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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 14 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 72 Months Ended 12 Months Ended 36 Months Ended 72 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 7 Months Ended 12 Months Ended 4 Months Ended
Nov. 30, 2012
plaintiff
Sep. 04, 2012
Sep. 30, 2013
plaintiff
Mar. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Oct. 20, 2013
patent
Sep. 30, 2013
Minimum
Sep. 30, 2013
Maximum
Dec. 31, 2010
Court of Common Pleas, Philadelphia County
Jan. 04, 2011
Court of Common Pleas, Philadelphia County
plaintiff
Apr. 22, 2011
Settlement Agreement
Jan. 04, 2011
Settlement Agreement
Apr. 22, 2011
Settlement Agreement
release
Apr. 29, 2011
Settlement Agreement
Sep. 30, 2013
Prior Year
Dec. 31, 2012
Prior Year
Dec. 31, 2004
1999-2004
Circuit Court Of Cook County
plaintiff
case
Dec. 31, 2008
2009
Circuit Court Of Cook County
case
Dec. 31, 2008
2008
Circuit Court Of Cook County
plaintiff
Dec. 31, 2009
2007-2009
Court of Common Pleas, Philadelphia County
case
plaintiff
Dec. 31, 2004
Outside Chicago Firefighter Plaintiffs
1999-2004
Circuit Court Of Cook County
plaintiff
Dec. 31, 2009
Pennsylvania Firefighter Plaintiffs
2009
Circuit Court Of Cook County
plaintiff
Nov. 30, 2012
Chicago Firefighter Plaintiffs
plaintiff
Dec. 31, 2012
Chicago Firefighter Plaintiffs
plaintiff
Nov. 30, 2011
Chicago Firefighter Plaintiffs
plaintiff
Dec. 31, 2009
Chicago Firefighter Plaintiffs
Minimum
plaintiff
Dec. 31, 2009
Chicago Firefighter Plaintiffs
Maximum
plaintiff
Dec. 31, 2009
Chicago Firefighter Plaintiffs
2009
plaintiff
Sep. 13, 2012
Chicago Firefighter Plaintiffs
2009
Circuit Court Of Cook County
justice
Dec. 31, 2009
Chicago Firefighter Plaintiffs
2009
Circuit Court Of Cook County
plaintiff
Oct. 31, 2012
Philadelphia Firefighter Plaintiffs
Court of Common Pleas, Philadelphia County
plaintiff
case
Dec. 31, 2010
Philadelphia Firefighter Plaintiffs
2010
Court of Common Pleas, Philadelphia County
plaintiff
Jul. 31, 2013
Pittsburgh Firefighter Plaintiffs
Allegheny County, Pennsylvania
plaintiff
Commitments Disclosure [Line Items]                                                                    
Amount outstanding standby letters of credit     $ 29.1   $ 29.1 $ 29.2                                                        
Warranty maturity periods               1 year 10 years                                                  
Reserves related to environmental remediation     1.4   1.4 1.8                                                        
Number of additional cases filed by firefighters                                   33 6   71               40     20    
Number of plaintiffs     74                     1,069       2,443     71 1,800 299 3 3 8 9 40       20 9 246
Number of cases of plaintiff's claims                                       27 3                          
Plaintiff's counsel later moved to reduce the number of plaintiff                                                             9      
Claims settled amount                         3.8                                   0.4      
Number of justices upholding verdict                                                           2        
Number of justices dissenting verdict                                                           1        
Number of plaintiffs cases dismissed 2                                                                  
Damages maximum amount                   0.1                                                
Damages subsequently reduced, minimum amount                   0.08                                                
Number of claimants settled                     1,125                                              
Percentage of claimants agreed for settlement                       95.02%   95.02% 93.00%                                      
Percentage of claimants agreed for settlement as per settlement agreement                             100.00%                                      
Settlement Agreement payment made                       3.6                                            
Reimbursement         0.2                     0.2 0.7                                  
Reimbursement received       $ 0.1   $ 0.6                                                        
Number of Patents             2                                                      
Holding period purchase proceed held as security   48 months