Business Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			3
Segment information [Abstract]
Total assets	$ 11,399.5		$ 11,399.5		$ 5,980.4
Total property, plant and equipment, net	1,015.3		1,015.3		811.1
Total operating lease right-of-use assets	1,884.4		1,884.4		598.8
Net sales	2,122.6	$ 1,300.0	5,608.1	$ 3,723.0
Gross profit	952.8	551.5	2,360.5	1,543.4
Advertising expense	192.0	119.3	524.4	346.6
Other selling and marketing expense	288.8	114.3	779.5	353.3
General, administrative and other expenses	160.4	118.6	545.8	347.4
Loss on disposal of business			13.9
Equity income in earnings of unconsolidated affiliates	(3.1)	(2.5)	(10.9)	(10.5)
Operating income (loss)	314.7	201.8	507.8	506.6
Interest expense, net	69.9	30.8	203.7	98.5
Other expense, net	10.9	0.4	16.8	(0.5)
Income before income taxes	233.9	170.6	287.3	408.6
Depreciation and amortization	76.0	50.8	210.7	149.2
Capital expenditures	47.9	16.4	108.6	76.4
United States
Segment information [Abstract]
Total property, plant and equipment, net	887.1		887.1		704.1
Total operating lease right-of-use assets	1,665.1		1,665.1		401.0
Net sales	1,731.4	935.3	4,495.3	2,671.7
All other
Segment information [Abstract]
Total property, plant and equipment, net	128.2		128.2		107.0
Total operating lease right-of-use assets	219.3		219.3		197.8
Net sales	391.2	364.7	1,112.8	1,051.3
Tempur Sealy North America
Segment information [Abstract]
Net sales	736.1	1,015.3	2,080.7	2,894.8
Tempur Sealy North America \| United States
Segment information [Abstract]
Net sales	660.6	935.3	1,882.0	2,671.7
Tempur Sealy North America \| All other
Segment information [Abstract]
Net sales	75.5	80.0	198.7	223.1
Tempur Sealy International
Segment information [Abstract]
Net sales	315.7	284.7	914.1	828.2
Tempur Sealy International \| United States
Segment information [Abstract]
Net sales	0.0	0.0	0.0	0.0
Tempur Sealy International \| All other
Segment information [Abstract]
Net sales	315.7	284.7	914.1	828.2
Mattress Firm
Segment information [Abstract]
Net sales	1,070.8	0.0	2,613.3	0.0
Mattress Firm \| United States
Segment information [Abstract]
Net sales	1,070.8	0.0	2,613.3	0.0
Mattress Firm \| All other
Segment information [Abstract]
Net sales	0.0	0.0	0.0	0.0
Operating Segments \| Tempur Sealy North America
Segment information [Abstract]
Total assets	5,590.3		5,590.3		5,575.2
Total property, plant and equipment, net	612.3		612.3		687.7
Total operating lease right-of-use assets	324.5		324.5		407.1
Net sales	1,050.1	1,015.3	2,788.3	2,895.3
Inter-segment royalty expense (income)	9.6	9.3
Gross profit	429.6	410.6	1,017.8	1,141.0
Advertising expense	111.0	98.2	297.9	281.1
Other selling and marketing expense	62.6	67.1	194.6	205.4
General, administrative and other expenses	41.6	52.0	130.7	146.4
Loss on disposal of business			9.8
Operating income (loss)	214.4	193.3	384.8	508.1
Depreciation and amortization	30.0	32.3	91.0	94.5
Capital expenditures	7.1	9.7	18.4	46.5
Operating Segments \| Tempur Sealy International
Segment information [Abstract]
Total assets	1,522.7		1,522.7		1,477.6
Total property, plant and equipment, net	110.5		110.5		89.6
Total operating lease right-of-use assets	211.4		211.4		188.6
Net sales	315.8	284.7	914.5	828.3
Inter-segment royalty expense (income)	(9.6)	(9.3)
Gross profit	155.1	140.9	446.0	402.4
Advertising expense	21.8	21.1	71.6	65.5
Other selling and marketing expense	50.5	43.4	148.0	135.8
General, administrative and other expenses	28.9	27.2	89.4	83.3
Equity income in earnings of unconsolidated affiliates	(3.1)	(2.5)	(10.9)	(10.5)
Operating income (loss)	57.0	51.7	147.9	128.3
Depreciation and amortization	7.9	7.3	23.0	20.6
Capital expenditures	15.2	6.2	29.2	21.3
Operating Segments \| Mattress Firm
Segment information [Abstract]
Total assets	7,769.4		7,769.4		0.0
Total property, plant and equipment, net	262.7		262.7		0.0
Total operating lease right-of-use assets	1,345.4		1,345.4		0.0
Net sales	1,070.8		2,613.3
Gross profit	368.1		896.7
Advertising expense	59.2		154.9
Other selling and marketing expense	170.7		424.0
General, administrative and other expenses	57.0		162.5
Loss on disposal of business			4.1
Operating income (loss)	81.2		151.2
Depreciation and amortization	23.1		57.7
Capital expenditures	25.1		57.9
Corporate
Segment information [Abstract]
Total assets	2,332.0		2,332.0		3,580.0
Total property, plant and equipment, net	29.8		29.8		33.8
Total operating lease right-of-use assets	3.1		3.1		3.1
Net sales	0.0	0.0	0.0	0.0
Other selling and marketing expense	5.0	3.8	12.9	12.1
General, administrative and other expenses	32.9	39.4	163.2	117.7
Operating income (loss)	(37.9)	(43.2)	(176.1)	(129.8)
Depreciation and amortization	15.0	11.2	39.0	34.1
Capital expenditures	0.5	0.5	3.1	8.6
Inter-segment eliminations
Segment information [Abstract]
Total assets	(5,814.9)		(5,814.9)		$ (4,652.4)
Net sales	(314.1)	0.0	(708.0)	(0.6)
Inter-segment eliminations \| Tempur Sealy North America
Segment information [Abstract]
Net sales	314.0	0.0	707.6	0.5
Inter-segment royalty expense (income)			26.9	26.0
Inter-segment eliminations \| Tempur Sealy International
Segment information [Abstract]
Net sales	$ 0.1	$ 0.0	0.4	0.1
Inter-segment royalty expense (income)			$ (26.9)	$ (26.0)

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. And the total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

No definition available.