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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($) $ in Millions | 12 Months Ended
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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] + References 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. + References No definition available. + Details
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. + References No definition available. + Details
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. + References No definition available. + Details
Name: | tpx_SalesReturnsChargedToSalesAllowanceAccrual
Namespace Prefix: | tpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration