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Net Sales - Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 1,880.8	$ 1,233.6	$ 3,485.5	$ 2,423.0
United States
Disaggregation of Revenue [Line Items]
Net sales	1,522.1	903.2	2,763.9	1,736.4
All other
Disaggregation of Revenue [Line Items]
Net sales	358.7	330.4	721.6	686.6
Wholesale
Disaggregation of Revenue [Line Items]
Net sales	642.7	950.5	1,341.4	1,836.3
Direct
Disaggregation of Revenue [Line Items]
Net sales	1,238.1	283.1	2,144.1	586.7
Tempur Sealy North America
Disaggregation of Revenue [Line Items]
Net sales	638.4	978.4	1,344.6	1,879.5
Tempur Sealy North America | United States
Disaggregation of Revenue [Line Items]
Net sales	573.3	903.2	1,221.4	1,736.4
Tempur Sealy North America | All other
Disaggregation of Revenue [Line Items]
Net sales	65.1	75.2	123.2	143.1
Tempur Sealy North America | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	534.0	854.8	1,118.5	1,631.7
Tempur Sealy North America | Direct
Disaggregation of Revenue [Line Items]
Net sales	104.4	123.6	226.1	247.8
Tempur Sealy International
Disaggregation of Revenue [Line Items]
Net sales	293.6	255.2	598.4	543.5
Tempur Sealy International | United States
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Tempur Sealy International | All other
Disaggregation of Revenue [Line Items]
Net sales	293.6	255.2	598.4	543.5
Tempur Sealy International | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	108.7	95.7	222.9	204.6
Tempur Sealy International | Direct
Disaggregation of Revenue [Line Items]
Net sales	184.9	159.5	375.5	338.9
Mattress Firm
Disaggregation of Revenue [Line Items]
Net sales	948.8	0.0	1,542.5	0.0
Mattress Firm | United States
Disaggregation of Revenue [Line Items]
Net sales	948.8	0.0	1,542.5	0.0
Mattress Firm | All other
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Mattress Firm | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Mattress Firm | Direct
Disaggregation of Revenue [Line Items]
Net sales	$ 948.8	$ 0.0	$ 1,542.5	$ 0.0

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