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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Aug. 29, 2016
Goodwill [Roll Forward]    
Balance at December 31, 2015 $ 692,100,000  
Acquisition [1] 148,100,000  
Balance at September 30, 2016 544,000,000  
Goodwill 544,000,000  
Packaging    
Goodwill [Roll Forward]    
Balance at December 31, 2015 636,900,000  
Balance at September 30, 2016 488,800,000  
Goodwill 488,800,000  
Paper    
Goodwill [Roll Forward]    
Balance at December 31, 2015 55,200,000  
Balance at September 30, 2016 55,200,000  
Goodwill $ 55,200,000  
TimBar Corporation    
Goodwill [Roll Forward]    
Goodwill   $ 148,100
TimBar Corporation | Packaging    
Goodwill [Roll Forward]    
Goodwill   $ 148,100,000
[1] In connection with the August 2016 acquisition of TimBar Corporation (TimBar), the Company recorded $148.1 million of goodwill in the Packaging segment.