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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income attributable to Tempur Sealy International, Inc. $ 24.5 $ 21.3 $ 58.4 $ 60.9
Denominator:        
Denominator for basic earnings per common share-weighted average shares (in shares) 53.9 60.2 53.9 61.1
Effect of dilutive securities:        
Employee stock-based compensation (in shares) 0.6 0.6 0.7 0.6
Denominator for diluted earnings per common share-adjusted weighted average shares 54.5 60.8 54.6 61.7
Basic earnings per common share (in dollars per share) $ 0.45 $ 0.35 $ 1.08 $ 1.00
Diluted earnings per common share (in dollars per share) $ 0.45 $ 0.35 $ 1.07 $ 0.99
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) 1.5 0.4 1.5 0.4