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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Inventory [Abstract]    
Finished goods $ 137.5 $ 126.7
Work-in-process 13.6 14.0
Raw materials and supplies 63.3 58.5
Total 214.4 199.2
Movement in Standard Product Warranty Accrual [Roll Forward]    
Accrued expenses 14.2 14.9
Other non-current liabilities 15.0 14.7
Revenue Recognition [Abstract]    
Allowance for doubtful accounts included in accounts receivable, net 24.9 $ 23.3
Foreign Exchange Forward    
Revenue Recognition [Abstract]    
Notional amount 81.0  
Gain on derivative $ 1.7  
North America | Pillows    
Warranty Term [Abstract]    
Warranty term (in years) 3 years  
Non-prorated | International | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 5 years  
Prorated | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 10 years  
Minimum | North America | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 10 years  
Minimum | International | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 5 years  
Minimum | Non-prorated | North America | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 10 years  
Maximum | North America | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 25 years  
Maximum | International | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 15 years  
Maximum | Non-prorated | North America | Mattresses    
Warranty Term [Abstract]    
Warranty term (in years) 15 years  
Sales Returns    
Sales returns [Roll Forward]    
Beginning balance $ 28.5  
Amounts accrued 34.2  
Returns charged to accrual (32.8)  
Ending balance 29.9  
Warranty Reserves    
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance 29.6  
Amounts accrued 7.9  
Warranties charged to accrual (8.3)  
Ending balance $ 29.2