Business Segment and Geographic Information - Concentrations (Details) - Sales - Customer concentration risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Technical Products Business' Customer Number One
Concentrations
Percentage of concentration risk	8.00%
Technical Products Business' Customer Number One | Technical Products
Concentrations
Percentage of concentration risk	14.00%
Fine Paper And Packaging Business' Customer Number One
Concentrations
Percentage of concentration risk	8.00%	7.00%	7.00%
Fine Paper And Packaging Business' Customer Number One | Fine Paper and Packaging
Concentrations
Percentage of concentration risk	18.00%	16.00%	15.00%
Fine Paper And Packaging Business' Customer Number Two
Concentrations
Percentage of concentration risk		5.00%	7.00%
Fine Paper And Packaging Business' Customer Number Two | Fine Paper and Packaging
Concentrations
Percentage of concentration risk		12.00%	15.00%