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Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]          
Goodwill impairment charge       $ 55.2  
Charges for disposal of fixed assets       (4.1) $ (6.7)
Paper Reporting Unit          
Segment Reporting Information [Line Items]          
Goodwill impairment charge $ 55.2        
DeRidder, Louisiana Mill          
Segment Reporting Information [Line Items]          
Charges for disposal of fixed assets     $ 3.0    
DeRidder, Louisiana Mill | Hurricane Laura          
Segment Reporting Information [Line Items]          
Charges related to the impact of Hurricane Laura       10.0  
Wallula, Washington Mill          
Segment Reporting Information [Line Items]          
Restructuring charges         $ 0.6
Packaging and Paper          
Segment Reporting Information [Line Items]          
Restructuring charges   $ 3.3   24.1  
Packaging and Paper | COVID-19          
Segment Reporting Information [Line Items]          
Incremental out-of-pocket costs       $ 6.9