Retirement Plans - Defined Benefit Plans (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) facility	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
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		$ 0.8	$ 0.8	$ 0.9
Interest cost		1.2	1.9	1.8
Expected return on assets		(1.3)	(2.2)	(2.1)
Curtailment loss		0.0	0.0	0.1
Amortization of net gain		0.0	0.0	(0.1)
Settlement loss	$ 1.3	0.2	1.3	0.0
Net periodic pension cost		0.9	1.8	0.6
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive income
Net loss		1.5	0.2	9.0
Amortization of prior service cost		0.0	0.0	(0.2)
Amortization or settlement recognition of net (loss) gain		(0.2)	(1.3)	0.1
New prior service cost		0.0	0.1	0.1
Total recognized in other comprehensive loss (income)		$ 1.3	$ (1.0)	$ 9.0
Assumptions, calculated on a weighted-average basis, were used to determine pension costs
Discount rate (as a percent)		4.27%	4.12%	4.01%
Expected long term return on plan assets (as a percent)		6.71%	7.05%	7.00%
Change in Benefit Obligation:
Projected benefit obligation at beginning of year		$ 28.2	$ 47.1
Service cost		0.8	0.8	$ 0.9
Interest cost		1.2	1.9	1.8
Plan amendments		0.0	0.1
Actuarial loss (gain)		0.8	(3.3)
Settlements		(2.0)	(16.9)
Benefits paid		(1.1)	(0.8)
Expenses paid		0.0	(0.1)
Foreign currency exchange rate changes		0.1	(0.6)
Projected benefit obligation at end of year	28.2	28.0	28.2	47.1
Change in Plan Assets:
Fair value of plan assets at beginning of year		13.9	32.5
Actual return (loss) on assets		0.6	(1.3)
Employer contribution		10.2	1.1
Settlements		(2.0)	(16.9)
Benefits paid		(1.1)	(0.8)
Expenses paid		0.0	(0.1)
Foreign currency exchange rate changes		0.1	(0.6)
Fair value of plan assets at end of year	13.9	21.7	13.9	$ 32.5
Funded status	(14.3)	(6.3)	(14.3)
Decrease in benefit obligation	17.0
Decrease in plan assets	17.0
Amounts recognized in the Consolidated Balance Sheets:
Non-current benefit liability	14.5	6.3	14.5
Non-current benefit asset	$ 0.2	$ 0.0	$ 0.2
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations
Discount rate (percentage)	4.44%	4.06%	4.44%
United States Retirement Plan
Assumptions, calculated on a weighted-average basis, were used to determine pension costs
Discount rate (as a percent)		4.26%	3.94%	3.94%
Change in Plan Assets:
Employer contribution		$ 10.0
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations
Discount rate (percentage)	4.26%	4.06%	4.26%
Canadian Retirement Plan
Assumptions, calculated on a weighted-average basis, were used to determine pension costs
Discount rate (as a percent)		4.30%	4.20%	5.00%
Assumptions, calculated on a weighted-average basis, were used to determine benefit obligations
Discount rate (percentage)	4.30%	4.10%	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		$ 25.3
Projected benefit obligation at end of year	$ 25.3	24.9	$ 25.3
Change in Plan Assets:
Fair value of plan assets at beginning of year		10.8
Fair value of plan assets at end of year	10.8	18.6	10.8
Sealy | Canadian Retirement Plan
Change in Benefit Obligation:
Projected benefit obligation at beginning of year		2.9
Projected benefit obligation at end of year	2.9	3.1	2.9
Change in Plan Assets:
Fair value of plan assets at beginning of year		3.1
Fair value of plan assets at end of year	$ 3.1	$ 3.1	$ 3.1