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Commitments and Contingencies (Details) (Asbestos Issue [Member])
3 Months Ended
Mar. 31, 2012
Claim
Mar. 31, 2011
Claim
Asbestos Issue [Member]
   
Activity related to asbestos claims    
Pending claims - January 1 105,486 103,575
New claims 1,032 1,339
Settlements (345) (475)
Dismissals (10,491) (761)
Pending claims - March 31 95,682 103,678