Contingencies and Legal Matters (Details)	12 Months Ended
	Dec. 31, 2017 person
Loss Contingencies [Line Items]
Number of regular full-time employees	2,612
Contract Expiration Period Twelve Months
Loss Contingencies [Line Items]
Number of regular full-time employees	668
United States
Loss Contingencies [Line Items]
Number of hourly employees	1,174
Number of salaried employees	578
Europe
Loss Contingencies [Line Items]
Number of hourly employees	431
Number of salaried employees	429
Whiting, WI | June 2018
Loss Contingencies [Line Items]
Number of regular full-time employees	201
Neenah, WI | June 2018
Loss Contingencies [Line Items]
Number of regular full-time employees	264
Munising, MI | July 2018
Loss Contingencies [Line Items]
Number of regular full-time employees	203
GERMANY
Loss Contingencies [Line Items]
Percentage of salaried employees eligible to be represented by Mining, Chemicals and Energy Trade Union (IG BCE)	50.00%
Percentage of hourly employees eligible to be represented by Mining, Chemicals and Energy Trade Union (IG BCE)	80.00%
Appleton, WI | May 2019
Loss Contingencies [Line Items]
Number of regular full-time employees	103
Brattleboro, VT | August 2021
Loss Contingencies [Line Items]
Number of regular full-time employees	94
Lowville, NY | November 2021
Loss Contingencies [Line Items]
Number of regular full-time employees	108