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Segment and Geographical Information - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
core_business_area
Dec. 31, 2015
segment
core_business_area
Segment Reporting [Abstract]    
Number of reportable segments | segment   5
Sale of timberlands reclassification threshold | $ $ 20  
Number of core business areas | core_business_area 2 2