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Nature of Business and Summary of Significant Accounting Policies - Principals of Consolidation (Details) - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Jan. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Jan. 28, 2020
Jan. 01, 2018
Investment [Line Items]              
Distribution to GPIP to repurchase stock   $ 155.9 $ 345.5 $ 97.4      
Shares repurchased (in shares)         20,800,000    
Repurchase of common stock (in shares)       58.4      
Less: Unamortized Deferred Debt Issuance Costs   12.5 10.6   $ 12.5    
Debt Issuance Cost   5.0 7.9 0.0      
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid   $ 248.5 $ 241.9 $ 0.0      
Subsequent Event              
Investment [Line Items]              
Shares repurchased (in shares) 15,100,000            
Repurchase of common stock (in shares) $ 250.0            
Subsequent Event | International Paper Company              
Investment [Line Items]              
Ownership percentage in joint venture 18.30%         21.60%  
International Paper Company              
Investment [Line Items]              
Waiting period to exchange more shares (in days)   180 days          
Dollar value limit on repurchase of shares per exchange   $ 250.0          
Percentage limit on repurchase of shares per exchange   25.00%          
Rengo Riverwood Packaging, Ltd.              
Investment [Line Items]              
Ownership percentage in joint venture   50.00%     50.00%    
Graphic Packaging International Partners (GPIP)              
Investment [Line Items]              
Distribution to GPIP to repurchase stock         $ 247.9    
Graphic Packaging International Partners (GPIP) | International Paper Company              
Investment [Line Items]              
Shares issued (in shares)             79,911,591
Noncontrolling interest ownership percentage             20.50%
Graphic Packaging International Partners (GPIP) | GPI Holding III, LLC              
Investment [Line Items]              
Shares issued (in shares)             309,715,624
Parent's ownership percentage             79.50%
International Paper Company              
Investment [Line Items]              
Noncontrolling interest ownership percentage   21.60%     21.60%