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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2011
Asbestos [Member]
Dec. 31, 2012
Asbestos [Member]
Jun. 30, 2012
Asbestos [Member]
Jun. 30, 2012
Asbestos [Member]
Minimum [Member]
Jun. 30, 2012
Asbestos [Member]
Maximum [Member]
Loss Contingencies [Line Items]                  
Pending claims, approximate number             2,135    
Amount paid for settled claim           $ 12,400,000      
Reimbursement from insurance carrier for settled claims           900,000      
Range of possible loss, minimum             27,500,000    
Range of possible loss, maximum             66,500,000    
Increase for low end of range         1,800,000        
Decrease for high end of range         400,000        
Incremental provision for asbestos accrual         1,300,000        
Asbestos liability reserve             27,500,000    
Estimated legal costs               26,200,000 63,000,000
Changes in product warranties [Roll forward]                  
Balance, beginning of period 13,948,000 12,641,000 13,500,000 12,153,000          
Liabilities accrued for current year sales 20,233,000 18,481,000 35,656,000 32,337,000          
Settlement of warranty claims (15,332,000) (15,663,000) (30,307,000) (29,031,000)          
Balance, end of period $ 18,849,000 $ 15,459,000 $ 18,849,000 $ 15,459,000