Business Segment Information - Schedule of Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Total net sales and inter-segment sales	$ 1,823.5	$ 1,880.8	$ 3,625.0	$ 3,485.5
Gross profit	817.2	827.2	1,594.1	1,407.7
Advertising expenses	177.6	189.5	328.0	332.4
Other selling and marketing expenses	275.9	271.0	554.0	490.7
General, administrative and other expenses	165.1	$ 175.9	332.0	$ 385.4
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]		Loss on disposal of business		Loss on disposal of business
Loss on disposal of business		$ 13.9		$ 13.9
Equity income in earnings of unconsolidated affiliates	(3.1)	(3.0)	(8.7)	(7.8)
Operating income (loss)	201.7	179.9	388.8	193.1
Interest expense, net	59.0	72.5	119.0	133.8
Other income, net	(5.1)	4.7	(15.3)	5.9
Income (loss) before income taxes	147.8	102.7	285.1	53.4
Depreciation and amortization	73.4	68.6	145.9	134.7
Capital expenditures	54.7	36.7	115.2	60.7
Inter-segment eliminations
Segment Reporting [Line Items]
Total net sales and inter-segment sales	(297.7)	(263.6)	(599.9)	(393.9)
Corporate
Segment Reporting [Line Items]
Total net sales and inter-segment sales	0.0	0.0	0.0	0.0
Other selling and marketing expenses	6.0	4.3	12.1	7.9
General, administrative and other expenses	45.2	48.9	82.5	130.3
Equity income in earnings of unconsolidated affiliates	0.4	0.0	(0.9)
Operating income (loss)	(50.8)	(53.2)	(93.7)	(138.2)
Depreciation and amortization	13.8	12.8	24.1	24.0
Capital expenditures	1.6	1.9	1.7	2.6
Mattress Firm
Segment Reporting [Line Items]
Total net sales and inter-segment sales	922.2	948.8	1,808.1	1,542.5
Mattress Firm | Operating Segments
Segment Reporting [Line Items]
Total net sales and inter-segment sales	925.7	948.8	1,814.4	1,542.5
Gross profit	307.5	337.4	580.4	528.6
Advertising expenses	45.8	62.1	76.7	95.7
Other selling and marketing expenses	154.2	151.8	308.1	253.3
General, administrative and other expenses	48.1	56.2	102.8	105.5
Loss on disposal of business		4.1		4.1
Operating income (loss)	59.4	63.2	92.8	70.0
Depreciation and amortization	21.0	17.9	44.5	34.6
Capital expenditures	34.8	23.6	82.1	32.8
Mattress Firm | Inter-segment eliminations
Segment Reporting [Line Items]
Total net sales and inter-segment sales	3.5	0.0	6.3
Tempur Sealy North America
Segment Reporting [Line Items]
Total net sales and inter-segment sales	601.8	638.4	1,165.3	1,344.6
Tempur Sealy North America | Operating Segments
Segment Reporting [Line Items]
Total net sales and inter-segment sales	895.9	901.9	1,758.7	1,738.2
Inter-segment royalty expense (income)	8.5	11.1
Gross profit	367.8	348.2	694.2	588.2
Advertising expenses	109.8	103.3	201.4	186.9
Other selling and marketing expenses	61.3	64.0	123.3	132.0
General, administrative and other expenses	40.8	41.0	81.9	89.1
Loss on disposal of business		9.8		9.8
Operating income (loss)	155.9	130.1	287.6	170.4
Depreciation and amortization	30.1	30.2	60.2	61.0
Capital expenditures	11.9	3.3	19.5	11.3
Tempur Sealy North America | Inter-segment eliminations
Segment Reporting [Line Items]
Total net sales and inter-segment sales	294.1	263.5	593.4	393.6
Inter-segment royalty expense (income)			17.2	17.3
Tempur Sealy International
Segment Reporting [Line Items]
Total net sales and inter-segment sales	299.5	293.6	651.6	598.4
Tempur Sealy International | Operating Segments
Segment Reporting [Line Items]
Total net sales and inter-segment sales	299.6	293.7	651.8	598.7
Inter-segment royalty expense (income)	(8.5)	(11.1)
Gross profit	141.9	141.6	319.5	290.9
Advertising expenses	22.0	24.1	49.9	49.8
Other selling and marketing expenses	54.4	50.9	110.5	97.5
General, administrative and other expenses	31.0	29.8	64.8	60.5
Equity income in earnings of unconsolidated affiliates	(2.7)	(3.0)	(7.8)	(7.8)
Operating income (loss)	37.2	39.8	102.1	90.9
Depreciation and amortization	8.5	7.7	17.1	15.1
Capital expenditures	6.4	7.9	11.9	14.0
Tempur Sealy International | Inter-segment eliminations
Segment Reporting [Line Items]
Total net sales and inter-segment sales	$ 0.1	$ 0.1	0.2	0.3
Inter-segment royalty expense (income)			$ (17.2)	$ (17.3)