Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income attributable to Tempur Sealy International, Inc.	$ 23.1	$ 33.9
Denominator:
Denominator for basic earnings per common share-weighted average shares (in shares)	54.3	53.9
Effect of dilutive securities:
Employee stock-based compensation (in shares)	0.6	0.7
Denominator for diluted earnings per common share-adjusted weighted average shares	54.9	54.6
Basic earnings per common share (in dollars per share)	$ 0.43	$ 0.63
Diluted earnings per common share (in dollars per share)	$ 0.42	$ 0.62
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)	1.5	1.5