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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                        
Net income attributable to Tempur Sealy International, Inc. $ 48.4 $ 44.6 $ 24.5 $ 33.9 $ 51.9 $ 77.8 $ 21.3 $ 39.6 $ 64.5 $ 151.4 $ 190.6 $ 64.5
Denominator:                        
Denominator for basic earnings per common share—weighted average shares                   54.0 59.0 61.7
Effect of dilutive securities:                        
Employee stock based compensation (in shares)                   0.7 0.8 0.9
Denominator for diluted earnings per common share—adjusted weighted average shares (in shares)                   54.7 59.8 62.6
Basic earnings per common share (in dollars per share) $ 0.89 $ 0.83 $ 0.45 $ 0.63 $ 0.93 $ 1.34 $ 0.35 $ 0.64 $ 1.05 $ 2.80 $ 3.23 $ 1.05
Diluted earnings per common share (in dollars per share) $ 0.88 $ 0.81 $ 0.45 $ 0.62 $ 0.92 $ 1.32 $ 0.35 $ 0.63 $ 1.03 $ 2.77 $ 3.19 $ 1.03
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)                 0.2 1.3 0.4