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Acquisitions (Price Purchase Allocation) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jan. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 761.1   $ 732.3
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