Net Sales - Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 2,122.6	$ 1,300.0	$ 5,608.1	$ 3,723.0
United States
Disaggregation of Revenue [Line Items]
Net sales	1,731.4	935.3	4,495.3	2,671.7
All other
Disaggregation of Revenue [Line Items]
Net sales	391.2	364.7	1,112.8	1,051.3
Wholesale
Disaggregation of Revenue [Line Items]
Net sales	739.3	981.8	2,080.7	2,818.1
Direct
Disaggregation of Revenue [Line Items]
Net sales	1,383.3	318.2	3,527.4	904.9
Tempur Sealy North America
Disaggregation of Revenue [Line Items]
Net sales	736.1	1,015.3	2,080.7	2,894.8
Tempur Sealy North America | United States
Disaggregation of Revenue [Line Items]
Net sales	660.6	935.3	1,882.0	2,671.7
Tempur Sealy North America | All other
Disaggregation of Revenue [Line Items]
Net sales	75.5	80.0	198.7	223.1
Tempur Sealy North America | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	626.4	878.4	1,744.9	2,510.1
Tempur Sealy North America | Direct
Disaggregation of Revenue [Line Items]
Net sales	109.7	136.9	335.8	384.7
Tempur Sealy International
Disaggregation of Revenue [Line Items]
Net sales	315.7	284.7	914.1	828.2
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	315.7	284.7	914.1	828.2
Tempur Sealy International | Wholesale
Disaggregation of Revenue [Line Items]
Net sales	112.9	103.4	335.8	308.0
Tempur Sealy International | Direct
Disaggregation of Revenue [Line Items]
Net sales	202.8	181.3	578.3	520.2
Mattress Firm
Disaggregation of Revenue [Line Items]
Net sales	1,070.8	0.0	2,613.3	0.0
Mattress Firm | United States
Disaggregation of Revenue [Line Items]
Net sales	1,070.8	0.0	2,613.3	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	$ 1,070.8	$ 0.0	$ 2,613.3	$ 0.0