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Restructuring and Related Activities - Summary of Incurred Costs (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
facility
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]        
Amount of total that represents net cash charges     $ 2.7  
2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring-related costs $ 12.3 $ 34.3    
Amount of total that represents net cash charges 11.0 $ 26.6    
Bedding Products | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Number of facilities | facility   50    
Aerospace business | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring-related costs 1.0      
Net restructuring and restructuring-related | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring-related costs 11.7 $ 31.1    
Net restructuring and restructuring-related | Bedding Products | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring-related costs 7.4 24.0    
Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring-related costs 0.6 3.2    
Minimum | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs 65.0 65.0    
Expected cash charges 30.0 $ 30.0    
Minimum | Forecast | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs       $ 40.0
Minimum | Bedding Products | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Number of facilities consolidated | facility   15    
Minimum | Net restructuring and restructuring-related | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs 40.0 $ 40.0    
Minimum | Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs 25.0 25.0    
Maximum | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs 85.0 85.0    
Expected cash charges 40.0 $ 40.0    
Maximum | Forecast | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs       $ 50.0
Maximum | Bedding Products | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Number of facilities consolidated | facility   20    
Maximum | Net restructuring and restructuring-related | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs 55.0 $ 55.0    
Maximum | Impairment costs associated with this plan (See Note F) | 2024 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring costs $ 30.0 $ 30.0