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Revenue Recognition - Sales (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
product_category
channel
Mar. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]    
Net sales $ 690.9 $ 637.4
Number of products sales channels | channel 2  
Number of product categories | product_category 2  
Operating Segments    
Disaggregation of Revenue [Line Items]    
Net sales $ 690.9 637.4
Operating Segments | United States    
Disaggregation of Revenue [Line Items]    
Net sales 497.2 440.2
Operating Segments | Canada    
Disaggregation of Revenue [Line Items]    
Net sales 46.8 44.8
Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Net sales 146.9 152.4
Operating Segments | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 629.8 576.0
Operating Segments | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 61.1 61.4
Operating Segments | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 615.9 583.1
Operating Segments | Direct    
Disaggregation of Revenue [Line Items]    
Net sales 75.0 54.3
Operating Segments | North America    
Disaggregation of Revenue [Line Items]    
Net sales 544.0 485.0
Operating Segments | North America | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 514.4 452.3
Operating Segments | North America | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 29.6 32.7
Operating Segments | North America | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 501.8 454.0
Operating Segments | North America | Direct    
Disaggregation of Revenue [Line Items]    
Net sales 42.2 31.0
Operating Segments | International    
Disaggregation of Revenue [Line Items]    
Net sales 146.9 152.4
Operating Segments | International | Bedding products    
Disaggregation of Revenue [Line Items]    
Net sales 115.4 123.7
Operating Segments | International | Other products    
Disaggregation of Revenue [Line Items]    
Net sales 31.5 28.7
Operating Segments | International | Wholesale    
Disaggregation of Revenue [Line Items]    
Net sales 114.1 129.1
Operating Segments | International | Direct    
Disaggregation of Revenue [Line Items]    
Net sales $ 32.8 $ 23.3