Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income attributable to Tempur Sealy International, Inc.	$ 63.4	$ 77.8	$ 21.3	$ 39.6	$ (11.3)	$ 40.2	$ 21.2	$ 23.4	$ 202.1	$ 73.5	$ 108.9
Denominator:
Denominator for basic earnings per common share—weighted average shares									59.0	61.7	60.8
Effect of dilutive securities:
Employee stock based compensation (in shares)									0.8	0.9	1.3
Denominator for diluted earnings per common share—adjusted weighted average shares									59.8	62.6	62.1
Basic earnings per common share (in dollars per share)	$ 1.14	$ 1.34	$ 0.35	$ 0.64	$ (0.18)	$ 0.65	$ 0.35	$ 0.38	$ 3.43	$ 1.19	$ 1.79
Diluted earnings per common share (in dollars per share)	$ 1.12	$ 1.32	$ 0.35	$ 0.63	$ (0.18)	$ 0.64	$ 0.34	$ 0.38	$ 3.38	$ 1.17	$ 1.75
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)									0.4	0.2	0.3