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Commitments And Contingent Liabilities (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Producers
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2020
EUR (€)
Loss Contingencies [Line Items]            
Accrual for environmental loss contingencies     $ 185.0      
Accrual for environmental loss contingencies, gross     194.0      
Foreign VAT refund accrual including interest     12.0      
Liability for Asbestos and Environmental Claims, Net     115.0      
Asbestos litigation reserve adjustment   $ 43.0        
Cass Lake Minnesota [Member]            
Loss Contingencies [Line Items]            
Accrual for environmental loss contingencies     45.0      
Kalamazoo River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value       $ 37.0 $ 19.0  
Proposed consent decree, value of remediation payments     100.0      
Proposed consent decree, value of labor performed     135.7      
San Jacinto River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value     $ 115.0      
Responsible party percentage     50.00%      
Champion International Corporation [Member]            
Loss Contingencies [Line Items]            
Liability for Asbestos and Environmental Claims, Net $ 75.0          
Asbestos litigation reserve adjustment $ 43.0          
Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action [Member] | Kalamazoo River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value     $ 79.0      
Loss contingency, damages awarded, value     $ 50.0      
Loss Contingencies, share of damages     15.00%      
Italian Competition Authority [Member]            
Loss Contingencies [Line Items]            
Loss contingency, number of defendants | Producers     30      
Loss contingency accrual     $ 32.0     € 29
Northern Impoundment [Member] | San Jacinto River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value     105.0      
Liability for Asbestos and Environmental Claims, Net     55.0      
Southern Impoundment [Member] [Member] | San Jacinto River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value     10.0      
Southern Impoundment [Member] | San Jacinto River Superfund Site [Member]            
Loss Contingencies [Line Items]            
Liability for Asbestos and Environmental Claims, Net     $ 10.0