Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income attributable to Tempur Sealy International, Inc.	$ 46.6us-gaap_NetIncomeLoss	$ 37.1us-gaap_NetIncomeLoss	$ (2.2)us-gaap_NetIncomeLoss	$ 27.4us-gaap_NetIncomeLoss	$ 27.5us-gaap_NetIncomeLoss	$ 40.2us-gaap_NetIncomeLoss	$ (1.6)us-gaap_NetIncomeLoss	$ 12.5us-gaap_NetIncomeLoss	$ 108.9us-gaap_NetIncomeLoss	$ 78.6us-gaap_NetIncomeLoss	$ 106.8us-gaap_NetIncomeLoss
Denominator:
Denominator for basic earnings per common share—weighted average shares									60.8	60.3	61.5
Effect of dilutive securities:
Employee stock based compensation (in shares)									1.3	1.3	1.4
Denominator for diluted earnings per common share—adjusted weighted average shares									62.1	61.6	62.9
Basic earnings per common share (in dollars per share)	$ 0.77us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 1.79us-gaap_EarningsPerShareBasic	$ 1.30us-gaap_EarningsPerShareBasic	$ 1.74us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.65us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 1.28us-gaap_EarningsPerShareDiluted	$ 1.70us-gaap_EarningsPerShareDiluted
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)									0.3	0.3	0.2

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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