Revenue From Contracts With Customers - Disaggregation Of Revenue (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue from contracts with customers, payment term, discount, percent	1.00%
Revenue from contracts with customers, payment term, discount, days	20 days
Minimum
Disaggregation of Revenue [Line Items]
Accounts receivable, days sales outstanding	45 days
Maximum
Disaggregation of Revenue [Line Items]
Accounts receivable, days sales outstanding	55 days
International
Disaggregation of Revenue [Line Items]
Accounts receivable, customer credit terms	120 days
Fine Paper and Packaging | Minimum
Disaggregation of Revenue [Line Items]
Accounts receivable, days sales outstanding	20 days
Revenue from contracts with customers, payment term, discount, percent	0.00%
Fine Paper and Packaging | Maximum
Disaggregation of Revenue [Line Items]
Accounts receivable, days sales outstanding	30 days
Revenue from contracts with customers, payment term, discount, percent	2.00%
Revenue from Contract with Customer | Technical Products
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue from Contract with Customer | Fine Paper and Packaging
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Product Concentration Risk | Revenue from Contract with Customer | United States
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	71.00%	70.00%
Product Concentration Risk | Revenue from Contract with Customer | Germany
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	23.00%
Product Concentration Risk | Revenue from Contract with Customer | Rest of Europe
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	7.00%	7.00%
Product Concentration Risk | Revenue from Contract with Customer | Technical Products | Filtration
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	42.00%	42.00%
Product Concentration Risk | Revenue from Contract with Customer | Technical Products | Backings
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	25.00%	28.00%
Product Concentration Risk | Revenue from Contract with Customer | Technical Products | Specialty
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	33.00%	30.00%
Product Concentration Risk | Revenue from Contract with Customer | Fine Paper and Packaging | Graphic Imaging
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	79.00%	77.00%
Product Concentration Risk | Revenue from Contract with Customer | Fine Paper and Packaging | Packaging
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	21.00%	19.00%
Product Concentration Risk | Revenue from Contract with Customer | Fine Paper and Packaging | Filing/Office
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	0.00%	4.00%