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Commitments and Contingencies Asbestos Narrative (Details) - Asbestos [Member]
3 Months Ended 9 Months Ended 30 Months Ended 351 Months Ended
Mar. 31, 2021
USD ($)
cases
claimants
Sep. 30, 2019
USD ($)
claimants
Jun. 30, 2020
USD ($)
claimants
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
claimants
Dec. 31, 2019
claimants
Loss Contingencies [Line Items]            
Liabilities Subject to Compromise, Asbestos Obligations $ 27,900,000          
Loss Contingency, Pending Cases, Number | cases 347          
Loss Contingency, Pending Claims, Number | claimants 4,676       4,655 4,759
Total settlement costs       $ 10,300,000    
Loss Contingency, New Claims Filed, Number | claimants 62 219        
Percentage of settlement and defense costs covered by insurance       40.00%    
Legal Fees $ 530,000 $ 2,130,000        
Minimum [Member]            
Loss Contingencies [Line Items]            
Liabilities Subject to Compromise, Asbestos Obligations         $ 31,500,000  
Loss Contingency, New Claims Filed, Number | claimants     143      
Legal Fees     $ 2,200,000      
Maximum [Member]            
Loss Contingencies [Line Items]            
Liabilities Subject to Compromise, Asbestos Obligations         $ 43,300,000  
Loss Contingency, New Claims Filed, Number | claimants     173      
Legal Fees     $ 2,300,000      
Compensatory Only Damages [Member] | Pending Litigation [Member]            
Loss Contingencies [Line Items]            
Number of pending claims seeking specific amounts of damages | claimants 34