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Revenue Recognition - Sales (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
product_category
channel
Jun. 30, 2018
USD ($)
Disaggregation of Revenue [Line Items]        
Net sales $ 722.8 $ 659.9 $ 1,413.7 $ 1,297.3
Number of products sales channels | channel     2  
Number of product categories | product_category     2  
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales 722.8 659.9 $ 1,413.7 1,297.3
Operating Segments | United States        
Disaggregation of Revenue [Line Items]        
Net sales 533.7 477.7 1,030.9 917.9
Operating Segments | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 54.4 50.1 101.2 94.9
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 134.7 132.1 281.6 284.5
Operating Segments | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 662.6 601.3 1,292.4 1,177.3
Operating Segments | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 60.2 58.6 121.3 120.0
Operating Segments | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 632.2 601.6 1,248.1 1,184.7
Operating Segments | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 90.6 58.3 165.6 112.6
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Net sales 588.1 527.8 1,132.1 1,012.8
Operating Segments | North America | United States        
Disaggregation of Revenue [Line Items]        
Net sales 533.7 477.7 1,030.9 917.9
Operating Segments | North America | Canada        
Disaggregation of Revenue [Line Items]        
Net sales 54.4 50.1 101.2 94.9
Operating Segments | North America | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 554.2 497.4 1,068.6 949.7
Operating Segments | North America | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 33.9 30.4 63.5 63.1
Operating Segments | North America | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 528.5 494.3 1,030.3 948.3
Operating Segments | North America | Direct        
Disaggregation of Revenue [Line Items]        
Net sales 59.6 33.5 101.8 64.5
Operating Segments | International        
Disaggregation of Revenue [Line Items]        
Net sales 134.7 132.1 281.6 284.5
Operating Segments | International | Bedding products        
Disaggregation of Revenue [Line Items]        
Net sales 108.4 103.9 223.8 227.6
Operating Segments | International | Other products        
Disaggregation of Revenue [Line Items]        
Net sales 26.3 28.2 57.8 56.9
Operating Segments | International | Wholesale        
Disaggregation of Revenue [Line Items]        
Net sales 103.7 107.3 217.8 236.4
Operating Segments | International | Direct        
Disaggregation of Revenue [Line Items]        
Net sales $ 31.0 $ 24.8 $ 63.8 $ 48.1