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Acquisitions (Price Purchase Allocation) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Jan. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 765.2 $ 766.3  
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)
Redeemable 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