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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Inventory [Abstract]          
Finished goods $ 126.4   $ 126.4   $ 126.7
Work-in-process 12.2   12.2   10.0
Raw materials and supplies 68.7   68.7   62.5
Total 207.3   207.3   199.2
Movement in Standard Product Warranty Accrual [Roll Forward]          
Accrued expenses 17.8   17.8   14.9
Other non-current liabilities 13.2   13.2   11.2
Revenue Recognition [Abstract]          
Allowance for doubtful accounts included in accounts receivable, net 21.8   21.8   19.3
Research and Development Expenses {Abstract]          
Research and development costs charged to expense 4.7 5.4 16.1 14.8  
Revenue, Net [Abstract]          
Royalty income, net of royalty expense 4.4 4.1 13.5 9.2  
Tempur North America [Member] | Mattresses
          
Warranty Term [Abstract]          
Basis on which warranty of product is spread     prorated [1]    
Tempur North America [Member] | Pillows
          
Warranty Term [Abstract]          
Warranty term     3 years    
Tempur International [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     15 years [2]    
Basis on which warranty of product is spread     prorated [2]    
Tempur International [Member] | Pillows
          
Warranty Term [Abstract]          
Warranty term     3 years    
Sealy [Member] | Mattresses
          
Warranty Term [Abstract]          
Basis on which warranty of product is spread     prorated [1]    
Prorated [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     10 years    
Minimum [Member] | Tempur North America [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     10 years [1]    
Minimum [Member] | Sealy [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     10 years [1]    
Minimum [Member] | Non-prorated [Member] | Sealy [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     10 years    
Maximum [Member] | Tempur North America [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     25 years [1]    
Maximum [Member] | Sealy [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     25 years [1]    
Maximum [Member] | Non-prorated [Member] | Sealy [Member] | Mattresses
          
Warranty Term [Abstract]          
Warranty term     15 years    
Sales Returns [Member]
          
Sales returns [Abstract]          
Beginning balance     28.7    
Amounts accrued     96.6    
Returns charged to accrual     (92.9)    
Ending balance 32.4   32.4    
Warranty Reserves [Member]
          
Movement in Standard Product Warranty Accrual [Roll Forward]          
Beginning balance     26.1    
Amounts accrued     26.0    
Warranties charged to accrual     (21.1)    
Ending balance $ 31.0   $ 31.0    
[1] Products have various warranty terms, generally non-prorated for the first 10 to 15 years and then prorated for the balance of the warranty term.
[2] The last 10 years of warranty period are prorated on a straight-line basis.