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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Inventory [Abstract]          
Finished goods $ 132.3   $ 132.3   $ 134.0
Work-in-process 11.7   11.7   11.4
Raw materials and supplies 69.1   69.1   71.8
Total 213.1   213.1   217.2
Movement in Standard Product Warranty Accrual [Roll Forward]          
Accrued expenses 16.0   16.0   16.1
Other non-current liabilities 15.4   15.4   15.2
Revenue Recognition [Abstract]          
Allowance for doubtful accounts included in accounts receivable, net 22.0   22.0   $ 19.5
Redemption value adjustment 0.2   $ 1.1    
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     $ 32.3    
Amounts accrued     87.7    
Warranties charged to accrual     (89.5)    
Ending balance 30.5   30.5    
Warranty Reserves          
Movement in Standard Product Warranty Accrual [Roll Forward]          
Beginning balance     31.3    
Amounts accrued     22.5    
Warranties charged to accrual     (22.4)    
Ending balance $ 31.4   $ 31.4    
Comfort Revolution          
Revenue Recognition [Abstract]          
Equity method investment, ownership percentage 55.00%   55.00%    
Redemption Value as Multiplier of Earnings before Interest Taxes, Depreciation and Amortization 7.5   7.5    
Period of EBITDA considered for redemption value (in months)     12 months    
Income attributable to Comfort Revolution, LLC $ 0.5 $ 0.4 $ 1.0 $ 0.5  
Other Income          
Revenue Recognition [Abstract]          
Other income from partial litigation settlement     9.5    
Employee Severances and Facility Closures          
Revenue Recognition [Abstract]          
Restructuring expenses 2.4        
Expected restructuring charges $ 8.0   $ 8.0