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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in Accrued Sales Returns [Roll Forward]
Beginning balance	$ 39.3	$ 34.3
Amounts accrued	111.9	112.4
Returns charged to accrual	(106.3)	(107.4)
Ending balance	$ 44.9	$ 39.3

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- Definition

Changes in Accrued Sales Returns [Roll Forward]

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No definition available.

+ Details

Name:	tpx_ChangesinAccruedSalesReturnsRollForward
Namespace Prefix:	tpx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date for estimated product return rights granted to customers.

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No definition available.

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Name:	tpx_SalesReturnsAccrual
Namespace Prefix:	tpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Increase in the accrual for estimated sales returns.

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No definition available.

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Name:	tpx_SalesReturnsAndAllowancesGood
Namespace Prefix:	tpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Reduction in the accrual for returns charged to sales. The aggregate refunds recognized during an accounting period due to goods returned.

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No definition available.

+ Details

Name:	tpx_SalesReturnsChargedToSalesAllowanceAccrual
Namespace Prefix:	tpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration