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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
USD ($)
Sep. 30, 2017
Dec. 31, 2018
USD ($)
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Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2015
USD ($)
Summary of Significant Accounting Policies [Line Items]                        
Research and development costs             $ 14,400,000 $ 12,800,000 $ 13,300,000      
Cash and cash equivalents $ 361,500,000       $ 216,900,000   361,500,000 216,900,000 239,300,000     $ 184,200,000
Cash equivalents 311,100,000       160,200,000   311,100,000 160,200,000        
Allowance for doubtful accounts 4,600,000       4,200,000   $ 4,600,000 4,200,000        
Customer returns, allowances and earned discounts as a percentage of gross selling price             1.00%          
Reserve for customer accounts receivable, percentage             1.00%          
Reserve for customer deductions             $ 9,000,000 8,400,000        
Interest capitalization, construction in progress             4,500,000 2,500,000 2,500,000      
Depreciation expense             361,700,000 347,800,000 324,100,000      
Incremental depreciation             $ 14,500,000 $ 10,500,000 2,900,000      
Intangible asset, useful life, in years             10 years 9 months 18 days 11 years 8 months 12 days        
Goodwill 917,300,000       883,200,000   $ 917,300,000 $ 883,200,000 737,900,000      
Goodwill and intangible asset impairment             0 0 0      
Deferred financing costs 12,600,000       15,300,000   $ 12,600,000 15,300,000        
Area leased under timberland cutting rights (acres) | a             75,000          
Area leased where fiber farms are operated (acres) | a             3,000          
Depletion expense             $ 7,600,000 5,200,000 4,700,000      
Net loss on impairment of assets             3,100,000 13,500,000        
Software amortization expense             2,100,000 2,300,000 2,500,000      
Retained earnings 2,315,800,000       1,867,400,000   2,315,800,000 1,867,400,000        
Cost of sales             5,369,300,000 4,974,100,000 4,502,900,000      
Other long-term assets                        
Summary of Significant Accounting Policies [Line Items]                        
Long-term lease costs capitalization (Cutting rights and Fiber farms) 22,400,000       31,500,000   22,400,000 31,500,000        
Net capitalized software costs 1,600,000       3,300,000   1,600,000 3,300,000        
Adjustments for New Accounting Pronouncement | Long-term debt                        
Summary of Significant Accounting Policies [Line Items]                        
Deferred financing costs $ 12,600,000       $ 15,300,000   12,600,000 15,300,000        
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606                        
Summary of Significant Accounting Policies [Line Items]                        
Retained earnings                     $ 1,600,000  
Cost of sales             $ 28,200,000          
ASU 2017-07                        
Summary of Significant Accounting Policies [Line Items]                        
Reclassification of components of income from operation and interest expense, net and other               $ 1,300,000 $ 3,000,000      
Customer Relationships                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             10 years 10 months 24 days 11 years 9 months 18 days        
Trademarks and Trade Names                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             10 years 1 month 6 days 9 years 9 months 18 days        
Minimum                        
Summary of Significant Accounting Policies [Line Items]                        
Term of senior credit facilities and notes, in years             3 years          
Minimum | ASU 2016-02                        
Summary of Significant Accounting Policies [Line Items]                        
Recognition of lease liabilities                   $ 220,000,000    
Minimum | Customer Relationships                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             10 years          
Minimum | Trademarks and Trade Names                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             5 years          
Maximum                        
Summary of Significant Accounting Policies [Line Items]                        
Term of senior credit facilities and notes, in years             10 years          
Maximum | ASU 2016-02                        
Summary of Significant Accounting Policies [Line Items]                        
Recognition of lease liabilities                   $ 240,000,000    
Maximum | Customer Relationships                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             40 years          
Maximum | Trademarks and Trade Names                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years             20 years          
Wallula, Washington Mill                        
Summary of Significant Accounting Policies [Line Items]                        
High-performance of virgin kraft linerboard machine percentage 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% 100.00%        
Foreign operations                        
Summary of Significant Accounting Policies [Line Items]                        
Cash and cash equivalents $ 2,300,000       $ 1,800,000   $ 2,300,000 $ 1,800,000