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Acquisitions (Price Purchase Allocation) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Apr. 01, 2019
Business Acquisition [Line Items]        
Goodwill $ 753.6   $ 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    
Long-term 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]        
Other intangible assets   $ 3.7    
Innovative Mattress Solutions, LLC (IMS)        
Business Acquisition [Line Items]        
Working capital (accounts receivable and inventory, net of accounts payable and accrued liabilities)       $ (1.4)
Property and equipment       5.0
Goodwill       2.4
Other intangible assets       2.1
Operating lease right-of-use assets       28.5
Long-term operating lease liabilities       (28.5)
Purchase price, net of cash acquired       $ 8.1