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Retirement Plans - Defined Benefit Plans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
facility
Dec. 31, 2017
USD ($)
Dec. 31, 2016
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 10    
Components of net periodic pension cost for employees      
Service cost $ 1.0 $ 0.9 $ 0.8
Interest cost 1.1 1.2 1.2
Expected return on assets (1.5) (1.5) (1.3)
Amortization of prior service cost 0.1 0.1 0.0
Settlement loss 0.0 0.0 0.2
Net periodic pension cost 0.7 0.7 0.9
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income      
Net loss 0.6 0.4 1.5
Amortization of prior service cost (0.1) (0.1) 0.0
Amortization or settlement recognition of net loss 0.0 0.0 (0.2)
New prior service cost 0.1 0.5 0.0
Total recognized in other comprehensive (loss) income $ 0.6 $ 0.8 $ 1.3
Assumptions, calculated on a weighted-average basis, were used to determine pension costs      
Discount rate (as a percent) 3.58% 4.07% 4.27%
Expected long term return on plan assets (as a percent) 6.25% 6.64% 6.71%
Change in Benefit Obligation:      
Projected benefit obligation at beginning of year $ 32.1 $ 28.0  
Service cost 1.0 0.9 $ 0.8
Interest cost 1.1 1.2 1.2
Plan amendments 0.1 0.5  
Actuarial (gain) loss (3.0) 2.3  
Benefits paid (0.9) (0.9)  
Expenses paid (0.1) (0.1)  
Foreign currency exchange rate changes (0.3) 0.2  
Projected benefit obligation at end of year 30.0 32.1 28.0
Change in Plan Assets:      
Fair value of plan assets at beginning of year 25.3 21.7  
Actual return on plan assets (2.1) 3.5  
Employer contribution 0.3 0.9  
Benefits paid (0.9) (0.9)  
Expenses paid (0.1) (0.1)  
Foreign currency exchange rate changes (0.3) 0.2  
Fair value of plan assets at end of year 22.2 25.3 $ 21.7
Funded status (7.8) (6.8)  
Amounts recognized in the Consolidated Balance Sheets:      
Non-current benefit liability 8.1 7.3  
Non-current benefit asset $ 0.3 $ 0.5  
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations      
Discount rate (percentage) 4.13% 3.56%  
United States Retirement Plan      
Assumptions, calculated on a weighted-average basis, were used to determine pension costs      
Discount rate (as a percent) 3.54% 4.06%  
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations      
Discount rate (percentage) 4.16% 3.54%  
Canadian Retirement Plan      
Assumptions, calculated on a weighted-average basis, were used to determine pension costs      
Discount rate (as a percent) 3.70% 4.10%  
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations      
Discount rate (percentage) 3.90% 3.70%  
Sealy      
Retirement plans      
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 $ 28.3    
Projected benefit obligation at end of year 26.5 $ 28.3  
Change in Plan Assets:      
Fair value of plan assets at beginning of year 21.0    
Fair value of plan assets at end of year 18.4 21.0  
Sealy | Canadian Retirement Plan      
Change in Benefit Obligation:      
Projected benefit obligation at beginning of year 3.8    
Projected benefit obligation at end of year 3.5 3.8  
Change in Plan Assets:      
Fair value of plan assets at beginning of year 4.3    
Fair value of plan assets at end of year $ 3.8 $ 4.3