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Contingencies (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2011
defendant
Dec. 31, 2011
Litigant
Claim
Dec. 31, 2010
Litigant
Dec. 31, 2009
Litigant
Dec. 31, 2011
Litigant
Claim
Dec. 31, 2010
Litigant
Dec. 31, 2009
Litigant
Dec. 31, 1993
Percentage of asbestos plaintiffs                
Sale of goods containing asbestos from 1948 to 1958         $ 40,000,000      
Approximate number of claims likely to be asserted in the future (in number of claims)   400     400      
Approximate number of claims disposed of to date (in number of litigants)   387,000     387,000      
Average indemnity payment per claim   8,100     8,100      
Deferred amounts payable   18,000,000 26,000,000   18,000,000 26,000,000    
Asbestos-related liability, total amount accrued beginning in 1993 through 2011 before insurance recoveries   4,000,000,000     4,000,000,000     975,000,000
Total amount awarded by jury against defendants 90,000,000              
Number of defendants (in number of defendants) 4              
Compensatory damages assessed against defendants 10,000,000              
Punitive damages assessed against the Company 40,000,000              
Future asbestos-related costs   $ 165,000,000 $ 170,000,000 $ 180,000,000 $ 165,000,000 $ 170,000,000 $ 180,000,000  
Approximate number of plaintiffs and claimants asbestos claims pending against the entity                
Pending at beginning of year (in number of litigants)         5,900 6,900 11,500  
Disposed (in number of litigants)         4,500 4,200 10,700  
Filed (in number of litigants)         3,200 3,200 6,100  
Pending at end of year (in number of litigants)   4,600 5,900 6,900 4,600 5,900 6,900  
Damages unspecified or sufficient to invoke jurisdictional minimum
                
Percentage of asbestos plaintiffs                
Percentage of asbestos plaintiffs, approximate percentage (as a percent)   71.00%     71.00%      
Damages of $15 million or less
                
Percentage of asbestos plaintiffs                
Percentage of asbestos plaintiffs, approximate percentage (as a percent)   27.00%     27.00%      
Damages greater than $15 million but less than $100 million
                
Percentage of asbestos plaintiffs                
Percentage of asbestos plaintiffs, approximate percentage (as a percent)   2.00%     2.00%      
Damages of $100 million or greater but less than $122 million
                
Percentage of asbestos plaintiffs                
Percentage of asbestos plaintiffs, fewer than percentage (as a percent)   1.00%     1.00%