Intercompany royalty income(loss) during the period.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Business Segment Information (Details) $ in Millions	3 Months Ended									12 Months Ended
Business Segment Information (Details) $ in Millions	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment										2
Segment information [Abstract]
Total assets	$ 2,694.0				$ 2,698.8					$ 2,694.0	$ 2,698.8
Total property, plant and equipment, net	435.1				422.2					435.1	422.2
Net sales	648.2	$ 724.8	$ 659.3	$ 722.1	771.1	$ 832.4	$ 804.4	$ 721.0	$ 3,154.6	2,754.4	3,128.9	$ 3,154.6
Inter-segment sales									0.0	0.0	0.0
Gross profit	273.3	312.2	268.6	286.6	317.5	362.1	336.9	291.0	1,249.2	1,140.7	1,307.5	1,249.2
Inter-segment royalty expense (income)										0.0	0.0
Operating income (loss)	77.7	$ 94.6	$ 56.6	$ 59.5	102.4	$ 131.1	$ 100.2	$ 76.7	306.5	288.4	410.4	306.5
Income (loss) before income taxes									191.1	188.4	271.8	$ 191.1
Depreciation and amortization									93.9	94.6	89.5
Capital expenditures									65.9	67.0	62.4
Bedding sales
Segment information [Abstract]
Net sales									2,890.0	2,521.8	2,892.9
Other sales
Segment information [Abstract]
Net sales									264.6	232.6	236.0
United States
Segment information [Abstract]
Total property, plant and equipment, net	373.2				360.7					373.2	360.7
Net sales									2,374.7	1,954.2	2,361.8
Canada
Segment information [Abstract]
Total property, plant and equipment, net	7.2				6.6					7.2	6.6
Net sales									202.5	219.6	208.3
Other International
Segment information [Abstract]
Total property, plant and equipment, net	54.7				54.9					54.7	54.9
Net sales									577.4	580.6	558.8
Total International
Segment information [Abstract]
Net sales									779.9	800.2	767.1
International
Segment information [Abstract]
Total property, plant and equipment, net	61.9				61.5					61.9	61.5
Operating Segments \| Tempur North America
Segment information [Abstract]
Total assets	2,759.4				2,581.4					2,759.4	2,581.4
Total property, plant and equipment, net	307.6				297.4					307.6	297.4
Net sales									2,577.2	2,173.8	2,570.1
Inter-segment sales									5.9	3.8	4.5
Gross profit									954.6	844.7	1,017.4
Inter-segment royalty expense (income)									7.1	5.5	7.2
Operating income (loss)									335.6	273.2	411.8
Income (loss) before income taxes									324.4	276.0	406.8
Depreciation and amortization									43.3	51.4	43.7
Capital expenditures									28.9	39.9	32.8
Operating Segments \| Tempur North America \| Bedding sales
Segment information [Abstract]
Net sales									2,428.9	2,051.8	2,447.8
Operating Segments \| Tempur North America \| Other sales
Segment information [Abstract]
Net sales									148.3	122.0	122.3
Operating Segments \| Tempur International
Segment information [Abstract]
Total assets	609.4				568.8					609.4	568.8
Total property, plant and equipment, net	54.7				54.9					54.7	54.9
Net sales									577.4	580.6	558.8
Inter-segment sales									0.7	0.9	0.4
Gross profit									294.6	296.0	290.1
Inter-segment royalty expense (income)									(7.1)	(5.5)	(7.2)
Operating income (loss)									96.3	104.9	97.6
Income (loss) before income taxes									64.2	77.5	82.5
Depreciation and amortization									16.0	14.7	15.6
Capital expenditures									14.8	9.4	15.3
Operating Segments \| Tempur International \| Bedding sales
Segment information [Abstract]
Net sales									461.1	470.0	445.1
Operating Segments \| Tempur International \| Other sales
Segment information [Abstract]
Net sales									116.3	110.6	113.7
Corporate
Segment information [Abstract]
Total assets	627.3				658.7					627.3	658.7
Total property, plant and equipment, net	72.8				69.9					72.8	69.9
Net sales									0.0	0.0	0.0
Inter-segment sales									0.0	0.0	0.0
Gross profit									0.0	0.0	0.0
Inter-segment royalty expense (income)									0.0	0.0	0.0
Operating income (loss)									(125.4)	(89.7)	(99.0)
Income (loss) before income taxes									(197.5)	(165.1)	(217.5)
Depreciation and amortization									34.6	28.5	30.2
Capital expenditures									22.2	17.7	14.3
Corporate \| Bedding sales
Segment information [Abstract]
Net sales									0.0	0.0	0.0
Corporate \| Other sales
Segment information [Abstract]
Net sales									0.0	0.0	0.0
Inter-segment eliminations
Segment information [Abstract]
Total assets	$ (1,302.1)				$ (1,110.1)					(1,302.1)	(1,110.1)
Net sales									0.0	0.0	0.0
Inter-segment sales									(6.6)	(4.7)	(4.9)
Gross profit									0.0	0.0	0.0
Inter-segment royalty expense (income)									0.0	0.0	0.0
Operating income (loss)									0.0	0.0	0.0
Income (loss) before income taxes									0.0	0.0	0.0
Depreciation and amortization									0.0	0.0	0.0
Capital expenditures									0.0	0.0	0.0
Inter-segment eliminations \| Bedding sales
Segment information [Abstract]
Net sales									0.0	0.0	0.0
Inter-segment eliminations \| Other sales
Segment information [Abstract]
Net sales									$ 0.0	$ 0.0	$ 0.0
Customer Concentration Risk \| Sales Revenue
Segment Reporting Information [Line Items]
Concentration risk, percentage											21.40%	23.70%