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Business Combinations - Additional Disclosures (Details)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 01, 2019
USD ($)
mill
facility
Sep. 30, 2018
USD ($)
facility
Jun. 12, 2018
USD ($)
facility
Jan. 01, 2018
facility
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]                
Payments to acquire business           $ 54.5 $ 89.4 $ 189.4
Identifiable intangible assets, customer relationships $ 6.5              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 38.5              
Goodwill $ 7.5         1,477.0 1,459.7 1,323.0
Net income from business acquisition           31.2    
Net sales from business acquisition           2.0    
Number of converting facilities acquired | facility 2              
Number of mills acquired | mill 1              
Assets           7,276.7 7,048.8 4,821.3
NACP Combination                
Business Acquisition [Line Items]                
Net income from business acquisition             134.7  
Net sales from business acquisition             1,407.1  
Debt assumed in transaction             660.0  
Business Combination, Consideration Transferred             1,800.0  
NACP Combination | Paperboard Mills                
Business Acquisition [Line Items]                
Number of mills | facility       2        
Assets             1,500.0  
Leticia Corporation                
Business Acquisition [Line Items]                
Payments to acquire business $ 52.5 $ 95.0            
Net income from business acquisition             42.4  
Reduction of depreciation expense         $ (5.0)      
Number of converting facilities acquired | facility   2            
PFP, LLC And PFP Dallas Converting, LLC                
Business Acquisition [Line Items]                
Payments to acquire business     $ 34.0          
Net income from business acquisition             1.4  
Number of converting facilities acquired | facility     2          
NACP Combination And PFP Acquisition                
Business Acquisition [Line Items]                
Identifiable intangible assets, customer relationships             150.1  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             1,713.9  
Goodwill             146.9  
Business Combination, Consideration Transferred             1,860.8  
Reduction of depreciation expense             $ 32.0  
Weighted average useful life of intangible assets             20 years  
Acquired Finite-Lived Intangible Assets, Attrition rate             5.00%  
Working capital true-up of PFP             $ (40.9)  
Artistic Carton Company                
Business Acquisition [Line Items]                
Number of converting facilities acquired | facility 2              
Number of mills acquired | mill 1              
Americas paperboard | Paperboard Mills                
Business Acquisition [Line Items]                
Assets             600.0  
Acquisitions in 2017                
Business Acquisition [Line Items]                
Payments to acquire business               $ 189.0
UNITED STATES | NACP Combination | Americas Paperboard Packaging                
Business Acquisition [Line Items]                
Number of converting facilities | facility       3        
UNITED KINGDOM | NACP Combination | Europe Paperboard Packaging                
Business Acquisition [Line Items]                
Number of converting facilities | facility       1        
Products And Services, Transition Services | NACP Combination | International Paper Company                
Business Acquisition [Line Items]                
Payments to suppliers unrelated to NACP combination           0.1 22.0  
Product And Services, Fiber Procurement And Corrugated Products | NACP Combination | International Paper Company                
Business Acquisition [Line Items]                
Payments to suppliers unrelated to NACP combination           12.4 15.9  
Product And Services, Wood | NACP Combination | International Paper Company                
Business Acquisition [Line Items]                
Payments to suppliers unrelated to NACP combination           229.1 194.0  
Products And Services, Ink Supply | NACP Combination | International Paper Company                
Business Acquisition [Line Items]                
Payments to suppliers unrelated to NACP combination           26.6 28.5  
Products And Services, Unrelated To Agreements | NACP Combination | International Paper Company                
Business Acquisition [Line Items]                
Payments to suppliers unrelated to NACP combination           $ 4.0 $ 6.0