Summary of Significant Accounting Policies (Details) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($) channel	Dec. 31, 2020 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Number of products sales channels \| channel	2
Ownership percentage	50.00%
Accrued expenses and other current liabilities
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accrued sales returns	$ 32.8	$ 31.6
Warranty Term [Abstract]
Accrued warranty expense	22.6	20.3
Other noncurrent liabilities
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accrued sales returns	15.5	13.3
Warranty Term [Abstract]
Accrued warranty expense	$ 24.5	$ 23.9
Mattresses \| Non-prorated \| International
Warranty Term [Abstract]
Warranty term (in years)	5 years
Mattresses \| Prorated \| International
Warranty Term [Abstract]
Warranty term (in years)	10 years
Mattresses \| Minimum \| North America
Warranty Term [Abstract]
Warranty term (in years)	10 years
Mattresses \| Minimum \| International
Warranty Term [Abstract]
Warranty term (in years)	5 years
Mattresses \| Minimum \| Non-prorated \| North America
Warranty Term [Abstract]
Warranty term (in years)	10 years
Mattresses \| Maximum \| North America
Warranty Term [Abstract]
Warranty term (in years)	25 years
Mattresses \| Maximum \| International
Warranty Term [Abstract]
Warranty term (in years)	15 years
Mattresses \| Maximum \| Non-prorated \| North America
Warranty Term [Abstract]
Warranty term (in years)	15 years
Pillows \| North America
Warranty Term [Abstract]
Warranty term (in years)	3 years

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249

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