CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 648.2	$ 724.8	$ 659.3	$ 722.1	$ 771.1	$ 832.4	$ 804.4	$ 721.0	$ 3,154.6	$ 2,754.4	$ 3,128.9	$ 3,154.6
Cost of sales									1,905.4	1,613.7	1,821.4	1,905.4
Gross profit	273.3	312.2	268.6	286.6	317.5	362.1	336.9	291.0	1,249.2	1,140.7	1,307.5	1,249.2
Selling and marketing expenses									648.0	601.3	648.5	648.0
General, administrative and other expenses									324.9	273.0	281.4	324.9
Customer termination charges, net										14.4	0.0	0.0
Equity income in earnings of unconsolidated affiliates									(11.9)	(15.6)	(13.3)	(11.9)
Royalty income, net of royalty expense									(18.3)	(20.8)	(19.5)	(18.3)
Operating (loss) income	77.7	94.6	56.6	59.5	102.4	131.1	100.2	76.7	306.5	288.4	410.4	306.5
Other expense, net:
Interest expense, net									102.5	108.0	91.6	102.5
Loss on extinguishment of debt							47.2		0.0	0.0	47.2	0.0
Other (income) expense, net									12.9	(8.0)	(0.2)	12.9
Total other expense, net									115.4	100.0	138.6	115.4
Income before income taxes									191.1	188.4	271.8	191.1
Income tax provision									(125.4)	(47.7)	(86.8)	(125.4)
Net income before non-controlling interests									65.7	140.7	185.0	65.7
Less: Net income attributable to non-controlling interests									1.2	(10.7)	(5.6)	1.2
Net income attributable to Tempur Sealy International, Inc.	$ 48.4	$ 44.6	$ 24.5	$ 33.9	$ 51.9	$ 77.8	$ 21.3	$ 39.6	$ 64.5	$ 151.4	$ 190.6	$ 64.5
Earnings per common share:
Basic (in dollars per share)	$ 0.89	$ 0.83	$ 0.45	$ 0.63	$ 0.93	$ 1.34	$ 0.35	$ 0.64	$ 1.05	$ 2.80	$ 3.23	$ 1.05
Diluted (in dollars per share)	$ 0.88	$ 0.81	$ 0.45	$ 0.62	$ 0.92	$ 1.32	$ 0.35	$ 0.63	$ 1.03	$ 2.77	$ 3.19	$ 1.03
Weighted average common shares outstanding:
Basic (in shares)										54.0	59.0	61.7
Diluted (in shares)										54.7	59.8	62.6