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COMMITMENTS AND CONTINGENCIES Environmental Remediation Obligations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2019
Jun. 30, 2011
Loss Contingencies [Line Items]              
Accrual for environmental loss contingencies $ 189.0   $ 189.0        
Accrual for environmental loss contingencies, gross 198.0   198.0        
Liability for Asbestos and Environmental Claims, Net 114.0   114.0        
Champion Products [Member]              
Loss Contingencies [Line Items]              
Liability for Asbestos and Environmental Claims, Net 75.0   $ 75.0        
Liability for Asbestos and Environmental Claims, Net, Period Increase (Decrease) 43.0            
Cass Lake, Minnesota              
Loss Contingencies [Line Items]              
Accrual for environmental loss contingencies             $ 46.0
Kalamazoo River Superfund Site              
Loss Contingencies [Line Items]              
Proposed consent decree, value of remediation payments           $ 100.0  
Proposed consent decree, value of labor performed           $ 135.7  
Kalamazoo River Superfund Site | Time Critical Removal Action              
Loss Contingencies [Line Items]              
Loss contingency, damages sought, value       $ 19.0 $ 37.0    
Kalamazoo River Superfund Site | Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action              
Loss Contingencies [Line Items]              
Responsible party percentage     15.00%        
Loss contingency, damages sought, value     $ 79.0        
Loss Contingency, damages awarded, value     $ 50.0        
San Jacinto River Superfund Site              
Loss Contingencies [Line Items]              
Responsible party percentage     50.00%        
Loss contingency, damages sought, value     $ 115.0        
Remediation design period     29 months        
San Jacinto River Superfund Site | Northern impoundment [Member]              
Loss Contingencies [Line Items]              
Accrual for environmental loss contingencies, gross 55.0   $ 55.0        
Loss contingency, damages sought, value     105.0        
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   $ 41.0          
San Jacinto River Superfund Site | Southern Impoundment [Member]              
Loss Contingencies [Line Items]              
Accrual for environmental loss contingencies, gross $ 10.0   10.0        
Loss contingency, damages sought, value     $ 10.0