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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net income attributable to Tempur Sealy International, Inc. $ 22.8 $ 24.5 $ 45.9 $ 58.4
Denominator:        
Denominator for basic earnings per common share-weighted average shares (in shares) 54.4 53.9 54.4 53.9
Effect of dilutive securities:        
Employee stock-based compensation (in shares) 0.5 0.6 0.6 0.7
Denominator for diluted earnings per common share-adjusted weighted average shares 54.9 54.5 55.0 54.6
Basic earnings per common share (in dollars per share) $ 0.42 $ 0.45 $ 0.84 $ 1.08
Diluted earnings per common share (in dollars per share) $ 0.42 $ 0.45 $ 0.83 $ 1.07
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) 1.6 1.5 1.6 1.5