Annual report pursuant to Section 13 and 15(d)

Plant Closure Expenses - Wood Plant Closures (Details)

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Plant Closure Expenses - Wood Plant Closures (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]  
Cash expenses $ 4.2
Non-cash expenses 25.4
Total closure expenses 29.6
Severance and employee benefit costs  
Restructuring Cost and Reserve [Line Items]  
Cash expenses 1.2
Decommissioning costs  
Restructuring Cost and Reserve [Line Items]  
Cash expenses 2.4
Contract termination costs  
Restructuring Cost and Reserve [Line Items]  
Cash expenses 0.6
Accelerated depreciation  
Restructuring Cost and Reserve [Line Items]  
Non-cash expenses 22.8
Asset write-downs and other non-cash exit costs  
Restructuring Cost and Reserve [Line Items]  
Non-cash expenses $ 2.6