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Restructuring and Related Activities - Schedule of Incurred Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]              
Goodwill impairment   $ 0.0 $ 675.3 $ 0.0 $ 675.3    
2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Expected restructuring costs $ 75.0     75.0     $ 75.0
Total restructuring-related costs       10.6   $ 47.8 58.4
Bedding Products              
Restructuring Cost and Reserve [Line Items]              
Goodwill impairment   0.0     587.2 0.7  
Other restructuring | 2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Expected restructuring costs 65.0     65.0     65.0
Total restructuring-related costs 1.0 11.7   8.6 31.1 43.6 52.2
Other restructuring | Bedding Products | 2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Total restructuring-related costs 0.3 $ 7.4   4.6 $ 24.0    
Net cash restructuring and restructuring-related | 2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Expected restructuring costs 40.0     40.0     40.0
Total restructuring-related costs       7.8   30.3 38.1
Net non-cash restructuring and restructuring-related | 2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Expected restructuring costs 25.0     25.0     25.0
Total restructuring-related costs       0.8   13.3 14.1
Goodwill and long-lived asset impairment costs | 2024 restructuring plan              
Restructuring Cost and Reserve [Line Items]              
Expected restructuring costs $ 10.0     10.0     10.0
Total restructuring-related costs       $ 2.0   $ 4.2 $ 6.2