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Revenue Recognition - Sales (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
channel
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
product_category
Disaggregation of Revenue [Line Items]                      
Net sales $ 676.1 $ 729.5 $ 659.9 $ 637.4 $ 631.4 $ 711.5 $ 647.3 $ 710.4 $ 2,702.9 $ 2,700.6 $ 3,079.7
Number of products sales channels | channel                 2    
Number of product categories | product_category                     2
Royalty income, net of royalty expense                 $ 0.0 20.8 $ 19.5
Shipping and handling included in net sales                 13.6 11.3 11.7
United States                      
Disaggregation of Revenue [Line Items]                      
Net sales                   1,954.2 2,361.9
Canada                      
Disaggregation of Revenue [Line Items]                      
Net sales                   219.6 208.2
Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Net sales                 2,702.9    
Operating Segments | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Net sales                 2,452.1    
Operating Segments | Direct                      
Disaggregation of Revenue [Line Items]                      
Net sales                 250.8    
Operating Segments | United States                      
Disaggregation of Revenue [Line Items]                      
Net sales                 1,928.9    
Operating Segments | Canada                      
Disaggregation of Revenue [Line Items]                      
Net sales                 207.3    
Operating Segments | International                      
Disaggregation of Revenue [Line Items]                      
Net sales                 566.7    
Operating Segments | Bedding products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 2,455.3    
Operating Segments | Other products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 247.6    
Operating Segments | North America                      
Disaggregation of Revenue [Line Items]                      
Net sales                 2,136.2 2,173.8 2,570.1
Operating Segments | North America | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Net sales                 1,989.1    
Operating Segments | North America | Direct                      
Disaggregation of Revenue [Line Items]                      
Net sales                 147.1    
Operating Segments | North America | United States                      
Disaggregation of Revenue [Line Items]                      
Net sales                 1,928.9    
Operating Segments | North America | Canada                      
Disaggregation of Revenue [Line Items]                      
Net sales                 207.3    
Operating Segments | North America | Bedding products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 2,002.1    
Operating Segments | North America | Other products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 134.1    
Operating Segments | International                      
Disaggregation of Revenue [Line Items]                      
Net sales                 566.7 $ 526.8 $ 509.6
Operating Segments | International | Wholesale                      
Disaggregation of Revenue [Line Items]                      
Net sales                 463.0    
Operating Segments | International | Direct                      
Disaggregation of Revenue [Line Items]                      
Net sales                 103.7    
Operating Segments | International | International                      
Disaggregation of Revenue [Line Items]                      
Net sales                 566.7    
Operating Segments | International | Bedding products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 453.2    
Operating Segments | International | Other products                      
Disaggregation of Revenue [Line Items]                      
Net sales                 $ 113.5