Business, Product and Geographical Area Information and Concentration of Risk - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 Productionfacility customer	Dec. 31, 2019 customer	Dec. 31, 2018 customer
Workforce Subject to Collective Bargaining Arrangements
Segment Reporting Information [Line Items]
Concentration risk, percentage	63.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year
Segment Reporting Information [Line Items]
Concentration risk, percentage	24.00%
Net sales | Customer Concentration Risk | Largest Customer
Segment Reporting Information [Line Items]
Concentration risk, percentage	26.00%	25.00%	25.00%
Number of customers | customer	1	1	1
Net sales | Customer Concentration Risk | Second Largest Customer
Segment Reporting Information [Line Items]
Concentration risk, percentage	11.00%	17.00%	15.00%
Trade receivables | Customer Concentration Risk | Largest Customer
Segment Reporting Information [Line Items]
Concentration risk, percentage	20.00%	41.00%
Trade receivables | Customer Concentration Risk | Second Largest Customer
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.00%	10.00%
Domestic
Segment Reporting Information [Line Items]
Number of production facilities	12
Canada
Segment Reporting Information [Line Items]
Number of production facilities	1