Guarantor/Non-Guarantor Financial Information - Schedule of Supplemental Condensed Consolidating Statements of Income and Comprehensive Income (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 24, 2016	Sep. 24, 2015
Statement of Income
Net sales	$ 871,300,000	$ 821,000,000.0	$ 722,800,000	$ 690,900,000	$ 676,100,000	$ 729,500,000	$ 659,900,000	$ 637,400,000	$ 3,106,000,000.0	$ 2,702,900,000	$ 2,700,600,000
Cost of sales									1,763,800,000	1,582,200,000	1,579,600,000
Gross profit	386,400,000	360,600,000	313,400,000	281,800,000	283,200,000	300,000,000.0	272,800,000	264,700,000	1,342,200,000	1,120,700,000	1,121,000,000.0
Selling and marketing expenses									666,300,000	587,800,000	586,100,000
General, administrative and other expenses									315,300,000	273,000,000.0	261,400,000
Customer-related charges									29,800,000	21,200,000	14,400,000
Equity income in earnings of unconsolidated affiliates									(15,900,000)	(17,600,000)	(15,600,000)
Royalty income, net of royalty expense									0	0	(20,800,000)
Operating (loss) income	84,600,000	120,600,000	81,000,000.0	60,500,000	57,900,000	84,700,000	58,000,000.0	55,700,000	346,700,000	256,300,000	295,500,000
Other expense, net:
Third party interest expense, net									85,700,000	92,300,000	87,300,000
Intercompany interest (income) expense, net									0	0	0
Interest expense (income), net									85,700,000	92,300,000	87,300,000
Other (income) expense, net									(4,500,000)	(1,000,000.0)	(7,200,000)
Total other expense, net									81,200,000	91,300,000	80,100,000
Income from equity investees									0	0	0
Income from continuing operations before income taxes									265,500,000	165,000,000.0	215,400,000
Income tax benefit (provision)									(74,700,000)	(49,600,000)	(43,800,000)
Income from continuing operations									190,800,000	115,400,000	171,600,000
Loss from discontinued operations, net of tax									(1,400,000)	(17,800,000)	(30,900,000)
Net income before non-controlling interests									189,400,000	97,600,000	140,700,000
Less: Net loss attributable to non-controlling interests									(100,000)	(2,900,000)	(10,700,000)
Net income attributable to Tempur Sealy International, Inc.	46,200,000	$ 73,300,000	$ 41,600,000	$ 28,400,000	12,300,000	$ 42,300,000	$ 22,800,000	$ 23,100,000	189,500,000	100,500,000	151,400,000
Comprehensive income attributable to Tempur Sealy International, Inc.									197,100,000	80,700,000	179,400,000
2023 Senior Notes
Guarantor/non-guarantor financial information
Senior notes, noncurrent	450,000,000.0				450,000,000.0				450,000,000.0	450,000,000.0			$ 450,000,000.0
2026 Senior Notes
Guarantor/non-guarantor financial information
Senior notes, noncurrent	600,000,000.0				600,000,000.0				600,000,000.0	600,000,000.0		$ 600,000,000.0
Securitized debt
Guarantor/non-guarantor financial information
Senior notes, noncurrent	$ 375,000,000.0				$ 375,000,000.0				375,000,000.0	375,000,000.0
Reportable Legal Entities | Tempur Sealy International, Inc. (Ultimate Parent)
Statement of Income
Net sales									0	0	0
Cost of sales									0	0	0
Gross profit									0	0	0
Selling and marketing expenses									11,200,000	8,400,000	5,600,000
General, administrative and other expenses									17,400,000	17,800,000	17,500,000
Customer-related charges									0		(8,400,000)
Equity income in earnings of unconsolidated affiliates									0	0	0
Royalty income, net of royalty expense											0
Operating (loss) income									(28,600,000)	(26,200,000)	(14,700,000)
Other expense, net:
Third party interest expense, net									56,300,000	59,200,000	59,600,000
Intercompany interest (income) expense, net									(9,800,000)	(6,900,000)	(4,700,000)
Interest expense (income), net									46,500,000	52,300,000	54,900,000
Other (income) expense, net									0	0	0
Total other expense, net									46,500,000	52,300,000	54,900,000
Income from equity investees									250,700,000	162,000,000.0	193,100,000
Income from continuing operations before income taxes									175,600,000	83,500,000	123,500,000
Income tax benefit (provision)									13,800,000	14,100,000	17,200,000
Income from continuing operations									189,400,000	97,600,000	140,700,000
Loss from discontinued operations, net of tax									0	0	0
Net income before non-controlling interests									189,400,000	97,600,000	140,700,000
Less: Net loss attributable to non-controlling interests									(100,000)	(2,900,000)	(10,700,000)
Net income attributable to Tempur Sealy International, Inc.									189,500,000	100,500,000	151,400,000
Comprehensive income attributable to Tempur Sealy International, Inc.									197,100,000	80,700,000	179,400,000
Reportable Legal Entities | Combined Guarantor Subsidiaries
Statement of Income
Net sales									2,387,100,000	2,000,900,000	1,961,200,000
Cost of sales									1,390,600,000	1,208,300,000	1,185,400,000
Gross profit									996,500,000	792,600,000	775,800,000
Selling and marketing expenses									466,000,000.0	392,000,000.0	406,800,000
General, administrative and other expenses									242,800,000	204,600,000	176,600,000
Customer-related charges									29,800,000	21,200,000	21,700,000
Equity income in earnings of unconsolidated affiliates									0	0	0
Royalty income, net of royalty expense											(20,800,000)
Operating (loss) income									257,900,000	174,800,000	191,500,000
Other expense, net:
Third party interest expense, net									26,700,000	30,200,000	26,000,000.0
Intercompany interest (income) expense, net									13,200,000	10,800,000	8,300,000
Interest expense (income), net									39,900,000	41,000,000.0	34,300,000
Other (income) expense, net									(7,600,000)	(9,900,000)	(17,200,000)
Total other expense, net									32,300,000	31,100,000	17,100,000
Income from equity investees									84,300,000	26,600,000	51,300,000
Income from continuing operations before income taxes									309,900,000	170,300,000	225,700,000
Income tax benefit (provision)									(59,200,000)	(8,300,000)	(32,600,000)
Income from continuing operations									250,700,000	162,000,000.0	193,100,000
Loss from discontinued operations, net of tax									0	0	0
Net income before non-controlling interests									250,700,000	162,000,000.0	193,100,000
Less: Net loss attributable to non-controlling interests									0	(2,600,000)	(5,200,000)
Net income attributable to Tempur Sealy International, Inc.									250,700,000	164,600,000	198,300,000
Comprehensive income attributable to Tempur Sealy International, Inc.									251,900,000	164,200,000	193,000,000.0
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries
Statement of Income
Net sales									793,500,000	800,500,000	862,500,000
Cost of sales									447,800,000	464,300,000	497,600,000
Gross profit									345,700,000	336,200,000	364,900,000
Selling and marketing expenses									189,200,000	199,800,000	188,900,000
General, administrative and other expenses									57,700,000	57,400,000	78,900,000
Customer-related charges									0		1,100,000
Equity income in earnings of unconsolidated affiliates									(15,900,000)	(17,600,000)	(15,600,000)
Royalty income, net of royalty expense											0
Operating (loss) income									114,700,000	96,600,000	111,600,000
Other expense, net:
Third party interest expense, net									2,700,000	4,600,000	22,400,000
Intercompany interest (income) expense, net									(3,400,000)	(3,900,000)	(3,600,000)
Interest expense (income), net									(700,000)	700,000	18,800,000
Other (income) expense, net									1,600,000	13,900,000	9,200,000
Total other expense, net									900,000	14,600,000	28,000,000.0
Income from equity investees									0	0	0
Income from continuing operations before income taxes									113,800,000	82,000,000.0	83,600,000
Income tax benefit (provision)									(29,500,000)	(55,400,000)	(32,300,000)
Income from continuing operations									84,300,000	26,600,000	51,300,000
Loss from discontinued operations, net of tax									0	0	0
Net income before non-controlling interests									84,300,000	26,600,000	51,300,000
Less: Net loss attributable to non-controlling interests									(100,000)	(300,000)	(5,500,000)
Net income attributable to Tempur Sealy International, Inc.									84,400,000	26,900,000	56,800,000
Comprehensive income attributable to Tempur Sealy International, Inc.									90,800,000	7,500,000	89,900,000
Reclassifications and Eliminations
Statement of Income
Net sales									(74,600,000)	(98,500,000)	(123,100,000)
Cost of sales									(74,600,000)	(90,400,000)	(103,400,000)
Gross profit									0	(8,100,000)	(19,700,000)
Selling and marketing expenses									(100,000)	(12,400,000)	(15,200,000)
General, administrative and other expenses									(2,600,000)	(6,800,000)	(11,600,000)
Customer-related charges									0		0
Equity income in earnings of unconsolidated affiliates									0	0	0
Royalty income, net of royalty expense											0
Operating (loss) income									2,700,000	11,100,000	7,100,000
Other expense, net:
Third party interest expense, net									0	(1,700,000)	(20,700,000)
Intercompany interest (income) expense, net									0	0	0
Interest expense (income), net									0	(1,700,000)	(20,700,000)
Other (income) expense, net									1,500,000	(5,000,000.0)	800,000
Total other expense, net									1,500,000	(6,700,000)	(19,900,000)
Income from equity investees									(335,000,000.0)	(188,600,000)	(244,400,000)
Income from continuing operations before income taxes									(333,800,000)	(170,800,000)	(217,400,000)
Income tax benefit (provision)									200,000	0	3,900,000
Income from continuing operations									(333,600,000)	(170,800,000)	(213,500,000)
Loss from discontinued operations, net of tax									(1,400,000)	(17,800,000)	(30,900,000)
Net income before non-controlling interests									(335,000,000.0)	(188,600,000)	(244,400,000)
Less: Net loss attributable to non-controlling interests									100,000	2,900,000	10,700,000
Net income attributable to Tempur Sealy International, Inc.									(335,100,000)	(191,500,000)	(255,100,000)
Comprehensive income attributable to Tempur Sealy International, Inc.									$ (342,700,000)	$ (171,700,000)	$ (282,900,000)