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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions		12 Months Ended
	Nov. 24, 2020	Dec. 31, 2020 USD ($) channel facility	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2020	Jan. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Number of products sales channels | channel		2
Stock split ratio	4
Operating lease right-of-use assets		$ 304.3	$ 245.4
Operating lease, liability		336.1
Total stockholders' deficit		(504.6)	(360.4)	$ (217.5)				$ (112.5)
Depreciation expense		80.5	73.8	71.8
Sales returns accrual		44.9	39.3	34.3
Shipping and handling included in cost of sales		223.1	192.2	169.1
Advertising costs charged to expense		332.5	280.5	259.3
Advertising costs deferred and included in prepaid expenses and other current assets		4.7	3.6
Research and development costs charged to expense		$ 23.1	23.0	21.9
Number of active plants | facility		2
Number of previously closed US facilities | facility		10
Retained Earnings
Business Acquisition [Line Items]
Total stockholders' deficit		$ (2,045.6)	(1,703.3)	$ (1,513.8)				(1,416.2)
Cumulative Effect, Period of Adoption, Adjustment
Business Acquisition [Line Items]
Operating lease right-of-use assets							$ 197.2
Operating lease, liability							$ 203.3
Total stockholders' deficit			6.5					3.4
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Business Acquisition [Line Items]
Total stockholders' deficit			6.5			$ 6.5		$ 2.9
Sealy And Stems & Foster
Business Acquisition [Line Items]
Ownership percentage					50.00%
Bedding | Non-prorated | International Segment
Business Acquisition [Line Items]
Warranty term (in years)		5 years
Bedding | Prorated | International Segment
Business Acquisition [Line Items]
Warranty term (in years)		10 years
Pillows Two | Non-prorated
Business Acquisition [Line Items]
Warranty term (in years)		3 years
Accrued liabilities and other current liabilities
Business Acquisition [Line Items]
Sales returns accrual		$ 31.6	26.2
Other non-current liabilities
Business Acquisition [Line Items]
Sales returns accrual		13.3	13.1
Standard product warranty accrual		23.9	22.2
Accounts payable and accrued liabilities
Business Acquisition [Line Items]
Standard product warranty accrual		$ 20.3	$ 19.4
Maximum | Bedding | North America Segment
Business Acquisition [Line Items]
Warranty term (in years)		25 years
Maximum | Bedding | International Segment
Business Acquisition [Line Items]
Warranty term (in years)		15 years
Maximum | Bedding | Non-prorated | North America Segment
Business Acquisition [Line Items]
Warranty term (in years)		15 years
Minimum | Bedding | North America Segment
Business Acquisition [Line Items]
Warranty term (in years)		10 years
Minimum | Bedding | International Segment
Business Acquisition [Line Items]
Warranty term (in years)		5 years
Minimum | Bedding | Non-prorated | North America Segment
Business Acquisition [Line Items]
Warranty term (in years)		10 years
Leasehold improvements | Maximum
Business Acquisition [Line Items]
Property, plant and equipment, useful life		7 years
Leasehold improvements | Minimum
Business Acquisition [Line Items]
Property, plant and equipment, useful life		4 years
Sealy Canada
Business Acquisition [Line Items]
Ownership percentage by parent		100.00%

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