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Net Sales - Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 1,604.7	$ 1,189.4
United States
Disaggregation of Revenue [Line Items]
Net sales	1,241.8	833.2
All other
Disaggregation of Revenue [Line Items]
Net sales	362.9	356.2
Wholesale
Disaggregation of Revenue [Line Items]
Net sales	698.7	885.8
Direct
Disaggregation of Revenue [Line Items]
Net sales	906.0	303.6
Tempur Sealy North America
Disaggregation of Revenue [Line Items]
Net sales	706.2	901.1
Tempur Sealy North America | United States
Disaggregation of Revenue [Line Items]
Net sales	648.1	833.2
Tempur Sealy North America | All other
Disaggregation of Revenue [Line Items]
Net sales	58.1	67.9
Tempur Sealy North America | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	584.5	776.9
Tempur Sealy North America | Direct
Disaggregation of Revenue [Line Items]
Net sales	121.7	124.2
Tempur Sealy International
Disaggregation of Revenue [Line Items]
Net sales	304.8	288.3
Tempur Sealy International | United States
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Tempur Sealy International | All other
Disaggregation of Revenue [Line Items]
Net sales	304.8	288.3
Tempur Sealy International | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	114.2	108.9
Tempur Sealy International | Direct
Disaggregation of Revenue [Line Items]
Net sales	190.6	179.4
Mattress Firm
Disaggregation of Revenue [Line Items]
Net sales	593.7	0.0
Mattress Firm | United States
Disaggregation of Revenue [Line Items]
Net sales	593.7	0.0
Mattress Firm | All other
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Mattress Firm | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Mattress Firm | Direct
Disaggregation of Revenue [Line Items]
Net sales	$ 593.7	$ 0.0

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