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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Apr. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]        
Goodwill, acquired during period     $ 26.7  
International        
Business Acquisition [Line Items]        
Goodwill, acquired during period     $ 0.0  
Sherwood Bedding        
Business Acquisition [Line Items]        
Percentage of voting interests acquired 80.00%      
Consideration transferred $ 39.1      
Cash and equivalents $ 1.2      
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    
Other intangible assets   $ 2.1