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Retirement Plans - Multi-employer Benefit Plans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
facility
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Multi-Employer Benefit Plans      
Domestic employees represented by various labor unions with separate collective bargaining agreements (percentage) 22.60%    
Expenses recognized for contributions     $ 0.7
Total contributions for most recent plan year available (percentage) 5.00%    
Red Zone      
Multi-Employer Benefit Plans      
Multi-employer plans funded status (percentage) (less than for Red and Yellow Zone, greater than for Green Zone) 65.00% 65.00%  
Yellow Zone      
Multi-Employer Benefit Plans      
Multi-employer plans funded status (percentage) (less than for Red and Yellow Zone, greater than for Green Zone) 80.00% 80.00%  
Number of years in which a multi-employer plan is projected to be a credit balance 7 years    
Green Zone      
Multi-Employer Benefit Plans      
Multi-employer plans funded status (percentage) (less than for Red and Yellow Zone, greater than for Green Zone) 80.00% 80.00%  
Number of years in which a multi-employer plan is projected not to be a credit balance 7 years    
Multi-employer Retirement Plan      
Multi-Employer Benefit Plans      
Number of domestic manufacturing facilities where employees are covered by union sponsored multiemployer plans | facility 6    
Expenses recognized for contributions $ 4.6 $ 4.3 3.9
Multi-employer Health and Welfare Plan | Multi-employer Retirement Plan      
Multi-Employer Benefit Plans      
Number of domestic manufacturing facilities where employees are covered by union sponsored multiemployer plans | facility 3    
Expenses recognized for contributions $ 3.4 3.8 $ 3.6
United Furniture Workers Pension Fund A | Multi-employer Retirement Plan      
Multi-Employer Benefit Plans      
Expenses recognized for contributions $ 1.5 $ 1.1  
Pension Plan of the National Retirement Fund      
Multi-Employer Benefit Plans      
Surcharge imposed 10.00% 10.00%  
Pension Plan of the National Retirement Fund | Multi-employer Retirement Plan      
Multi-Employer Benefit Plans      
Expenses recognized for contributions $ 1.1 $ 1.0  
Central States, Southeast & Southwest Areas Pension Plan      
Multi-Employer Benefit Plans      
Surcharge imposed 10.00% 10.00%  
Central States, Southeast & Southwest Areas Pension Plan | Multi-employer Retirement Plan      
Multi-Employer Benefit Plans      
Expenses recognized for contributions $ 1.0 $ 0.8