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Summary of Significant Accounting Policies - Changes In Accrued Sales Returns (Details) - Sales Returns $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Changes in Accrued Sales Returns [Roll Forward]
Beginning balance	$ 39.3
Amounts accrued	81.6
Returns charged to accrual	(78.8)
Ending balance	$ 42.1

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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_SalesReturnsAccrualCurrent
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.

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

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- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_SalesReturnsAndAllowancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: