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Retirement Plans - Defined Benefit Plans (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
facility
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Retirement plans        
Number of active plants at which a defined benefit pension plan for current and former hourly employees is provided | facility   2    
Number of previously closed U.S. facilities at which a defined benefit pension plan for current and former hourly employees was provided | facility   9    
Components of net periodic pension cost for employees        
Service cost   $ 0.8 $ 0.9 $ 0.9
Interest cost   1.9 1.8 1.3
Expected return on assets   (2.2) (2.1) (1.5)
Curtailment loss   0.0 0.1 0.0
Amortization of net gain   0.0 (0.1) 0.0
Settlement loss $ 1.3 1.3 0.0 0.0
Net periodic pension cost   1.8 0.6 0.7
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income        
Net loss   0.2 9.0 (6.2)
Amortization of prior service cost   0.0 (0.2) 1.0
Amortization or settlement recognition of net gain (loss)   (1.3) 0.1 0.0
New prior service cost   0.1 0.1 0.0
Total recognized in other comprehensive loss   $ (1.0) $ 9.0 $ (5.2)
Assumptions, calculated on a weighted-average basis, were used to determine pension costs        
Discount rate (as a percent)   4.12% 4.01% 4.23%
Expected long term return on plan assets (as a percent)   7.05% 7.00% 6.92%
Change in Benefit Obligation:        
Projected benefit obligation at beginning of year   $ 47.1 $ 36.4  
Service cost   0.8 0.9 $ 0.9
Interest cost   1.9 1.8 1.3
Plan amendments   0.1 0.2  
Actuarial (gain) loss   (3.3) 9.2  
Curtailments   0.0 (0.1)  
Settlements   (16.9) 0.0  
Benefits paid   (0.8) (0.7)  
Expenses paid   (0.1) (0.2)  
Foreign currency exchange rate changes   (0.6) (0.4)  
Projected benefit obligation at end of year 28.2 28.2 47.1 36.4
Change in Plan Assets:        
Fair value of plan assets at beginning of year   32.5 30.5  
Actual (loss) return on assets   (1.3) 2.2  
Employer contribution   1.1 1.0  
Benefits paid   (0.8) (0.7)  
Settlements   (16.9) 0.0  
Expenses paid   (0.1) (0.2)  
Foreign currency exchange rate changes   (0.6) (0.3)  
Fair value of plan assets at end of year 13.9 13.9 32.5 $ 30.5
Funded status (14.3) (14.3) (14.6)  
Decrease in benefit obligation 17.0      
Decrease in plan assets 17.0      
Amounts recognized in the Consolidated Balance Sheets:        
Non-current portion of benefit liability 14.5 14.5 14.9  
Non-current benefit asset $ 0.2 $ 0.2 $ 0.3  
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations        
Discount rate (percentage) 4.44% 4.44% 5.00%  
United States Retirement Plan        
Assumptions, calculated on a weighted-average basis, were used to determine pension costs        
Discount rate (as a percent)   3.94% 3.94% 4.25%
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations        
Discount rate (percentage) 4.26% 4.26% 5.00%  
Canadian Retirement Plan        
Assumptions, calculated on a weighted-average basis, were used to determine pension costs        
Discount rate (as a percent)   4.20% 5.00% 4.00%
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations        
Discount rate (percentage) 4.30% 4.30%    
Sealy        
Retirement plans        
Ownership interest (percentage)   100.00%    
Number of facilities where employees are covered by defined benefit pension plan | facility   1    
Sealy | United States Retirement Plan        
Change in Benefit Obligation:        
Projected benefit obligation at beginning of year   $ 43.7    
Projected benefit obligation at end of year $ 25.3 25.3 $ 43.7  
Change in Plan Assets:        
Fair value of plan assets at beginning of year   28.8    
Fair value of plan assets at end of year 10.8 10.8 28.8  
Sealy | Canadian Retirement Plan        
Change in Benefit Obligation:        
Projected benefit obligation at beginning of year   3.4    
Projected benefit obligation at end of year 2.9 2.9 3.4  
Change in Plan Assets:        
Fair value of plan assets at beginning of year   3.7    
Fair value of plan assets at end of year $ 3.1 $ 3.1 $ 3.7