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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]      
Beginning Balance   $ 918,700,000 $ 917,300,000
Impairment of Paper segment $ 0 (55,200,000)  
Ending Balance 863,500,000 863,500,000 918,700,000
Englander      
Goodwill [Line Items]      
Acquisitions [1]     1,400,000
Packaging      
Goodwill [Line Items]      
Beginning Balance   863,500,000 862,100,000
Ending Balance 863,500,000 863,500,000 863,500,000
Packaging | Englander      
Goodwill [Line Items]      
Acquisitions [1]     1,400,000
Paper      
Goodwill [Line Items]      
Beginning Balance   55,200,000 55,200,000
Impairment of Paper segment   (55,200,000)  
Ending Balance $ 0 $ 0 $ 55,200,000
[1] During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.