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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2012
Claim
Sep. 30, 2012
Claim
Dec. 31, 2009
Dec. 31, 2011
Sep. 30, 2012
Continuing Operations [Member]
Sep. 30, 2012
Discontinued Operations [Member]
Sep. 30, 2012
Asbestos Issue [Member]
Claim
Dec. 31, 2011
Asbestos Issue [Member]
Claim
Sep. 30, 2011
Asbestos Issue [Member]
Claim
Dec. 31, 2010
Asbestos Issue [Member]
Claim
Number of claims open 29,000 29,000         96,000 105,000 105,000 104,000
Recorded asbestos liability related to pending claims 36.00% 36.00%                
Estimated Receivables due from domestic insurers 89.00% 89.00%                
Aggregate settlement coverage agreement for asbestos related assets 58.00% 58.00%                
Decrease in estimated undiscounted asbestos related assets $ 78.7                  
Number of forecast periods to be maintained by each quarter   10 years                
Distribution from insolvent insurers   8.3                
Reduction to the net asbestos charge 5.8                  
Reduce in asbestos related asset 2.5                  
Tenure to be used to file undiscounted Asbestos liability including legal fees and claims   Next 10 Years                
Estimated asbestos exposure, net of expected recoveries from insurers and other responsible parties 715.7 715.7   713.7            
Asset related to a business disposed 233.8 233.8                
Liability related to a business disposed 245.2 245.2                
Proceeds from Disposed Business   10.0                
Reduction net asbestos liability included in discontinued operations   5.6                
Estimated Percentage of Recovered asbestos Costs   47.00%                
Percentage of Insurance Coverage Recoveries   24.00%                
Total asset related to insurance policy 8.2 8.2                
Insurance policy asset from continuing operations 6.7                  
Insurance policy asset from discontinued operations 1.5                  
Adjustment within Income From Continuing Operations 0.3       0.2 0.1        
Face value of bond issued     $ 500              
Interest rate on senior notes     6.125%