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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 01, 2019
Sep. 30, 2019
Mar. 31, 2019
Business Acquisition [Line Items]      
Goodwill, acquired during period   $ 8.7  
International      
Business Acquisition [Line Items]      
Transaction value $ 7.1    
Goodwill, acquired during period 2.9 $ 5.4  
Other intangible assets 2.9    
Innovative Mattress Solutions, LLC (IMS)      
Business Acquisition [Line Items]      
Transaction value 24.0    
Liabilities     $ 11.0
Consideration transferred 13.2    
Cash and equivalents 5.1    
Payments to acquire businesses 8.1    
Other intangible assets 2.1    
Innovative Mattress Solutions, LLC (IMS) | Trade Name and Customer Database      
Business Acquisition [Line Items]      
Intangible assets acquired $ 2.1