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Acquisitions and Divestitures - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2020
Apr. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Payments to acquire business     $ 41.2 $ 17.1 $ 0.0
Innovative Mattress Solutions, LLC (IMS)          
Business Acquisition [Line Items]          
Transaction value   $ 24.0      
Liabilities assumed   11.0      
Consideration transferred   13.2      
Cash and equivalents   5.1      
Sherwood Bedding          
Business Acquisition [Line Items]          
Consideration transferred $ 39.1        
Voting interest acquired 80.00%        
Cash acquired $ 1.2        
Trade Name and Customer Database | Innovative Mattress Solutions, LLC (IMS)          
Business Acquisition [Line Items]          
Intangible assets acquired   $ 2.1