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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 145 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2013
Asbestos [Member]
Claim
Sep. 30, 2013
Asbestos [Member]
Claim
Sep. 30, 2013
Asbestos [Member]
Minimum [Member]
Sep. 30, 2013
Asbestos [Member]
Maximum [Member]
Loss Contingencies [Line Items]                    
Pending claims, approximate number             2,250 2,250    
Amount paid for settled claim               $ 14,600,000    
Range of possible loss, minimum             24,400,000 24,400,000    
Range of possible loss, maximum             37,400,000 37,400,000    
Increase for low end of range             2,700,000      
Decrease for high end of range             2,700,000      
Estimated legal costs                 27,400,000 48,100,000
Changes in product warranties [Roll forward]                    
Balance, beginning of period     17,288,000 13,500,000 23,498,000 18,849,000        
Liabilities accrued for current year sales 20,755,000 23,226,000 61,131,000 58,882,000            
Settlement of warranty claims (23,556,000) (23,021,000) (57,722,000) (53,328,000)            
Balance, end of period $ 20,697,000 $ 19,054,000 $ 20,697,000 $ 19,054,000 $ 23,498,000 $ 18,849,000