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Goodwill and Other Intangible Assets - Goodwill by Reportable Business Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 722.5	$ 709.4
Goodwill resulting from acquisition		7.4
Foreign currency translation adjustments	10.6	5.7
Goodwill, Ending balance	733.1	722.5
Tempur North America | Tempur Sealy U.S.
Goodwill [Roll Forward]
Goodwill, Beginning balance	572.0	562.8
Goodwill resulting from acquisition		7.4
Foreign currency translation adjustments	4.6	1.8
Goodwill, Ending balance	576.6	572.0
Tempur International | Sealy Canada
Goodwill [Roll Forward]
Goodwill, Beginning balance	150.5	146.6
Goodwill resulting from acquisition		0.0
Foreign currency translation adjustments	6.0	3.9
Goodwill, Ending balance	$ 156.5	$ 150.5

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- Definition

Goodwill, Translation Adjustments and Other

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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