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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Noncontrolling Interest [Line Items]          
Stock Repurchased During Period, Shares 10,566,144   4,462,263 13,202,425  
Common Stock, Reduction in Shares Available for Issuance Upon Exchange 1,701,834        
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]          
Beginning Balance   $ 0.0      
Issuance of Redeemable Noncontrolling interest   255.2      
Reclassification to Redeemable Noncontrolling Interest for Share Repurchases   (12.5)      
Net Income Attributable to Redeemable Noncontrolling Interest   16.6      
Other Comprehensive Loss, Net of Tax   (2.8)      
Distributions of Membership Interest   (5.7)      
Ending Balance $ 275.8 $ 275.8 $ 0.0    
Graphic Packaging International Partners (GPIP) | International Paper Company          
Noncontrolling Interest [Line Items]          
Common units of GPIP issued         79,911,591
Shares of nonredeemable noncontrolling interest common stock issued         61,633,409