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Acquisitions and Divestitures - Sherwood Bedding Price Purchase Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 766.3   $ 732.3 $ 723.0
Sherwood Bedding        
Business Acquisition [Line Items]        
Working capital (accounts receivable and inventory, net of accounts payable and accrued liabilities)   $ 5.8    
Property and equipment   10.1    
Goodwill   26.7    
Operating lease right-of-use assets   19.9    
Operating lease liabilities   (19.9)    
Non-controlling interest   (8.4)    
Purchase price, net of cash acquired   37.9    
Sherwood Bedding | Customer Relationships        
Business Acquisition [Line Items]        
Customer relationships intangible assets   $ 3.7