Net Sales - Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Net sales	$ 1,823.5	$ 1,880.8	$ 3,625.0	$ 3,485.5
United States
Disaggregation of Revenue [Line Items]
Net sales	1,453.5	1,522.1	2,844.4	2,763.9
All other
Disaggregation of Revenue [Line Items]
Net sales	370.0	358.7	780.6	721.6
Direct
Disaggregation of Revenue [Line Items]
Net sales	1,202.3	1,238.1	2,398.6	2,144.1
Wholesale
Disaggregation of Revenue [Line Items]
Net sales	621.2	642.7	1,226.4	1,341.4
Mattress Firm
Disaggregation of Revenue [Line Items]
Net sales	922.2	948.8	1,808.1	1,542.5
Mattress Firm | United States
Disaggregation of Revenue [Line Items]
Net sales	922.2	948.8	1,808.1	1,542.5
Mattress Firm | All other
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	922.2	948.8	1,808.1	1,542.5
Mattress Firm | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Tempur Sealy North America
Disaggregation of Revenue [Line Items]
Net sales	601.8	638.4	1,165.3	1,344.6
Tempur Sealy North America | United States
Disaggregation of Revenue [Line Items]
Net sales	531.3	573.3	1,036.3	1,221.4
Tempur Sealy North America | All other
Disaggregation of Revenue [Line Items]
Net sales	70.5	65.1	129.0	123.2
Tempur Sealy North America | Direct
Disaggregation of Revenue [Line Items]
Net sales	97.4	104.4	187.4	226.1
Tempur Sealy North America | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	504.4	534.0	977.9	1,118.5
Tempur Sealy International
Disaggregation of Revenue [Line Items]
Net sales	299.5	293.6	651.6	598.4
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	299.5	293.6	651.6	598.4
Tempur Sealy International | Direct
Disaggregation of Revenue [Line Items]
Net sales	182.7	184.9	403.1	375.5
Tempur Sealy International | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	$ 116.8	$ 108.7	$ 248.5	$ 222.9