Guarantor/Non-Guarantor Financial Information - Schedule of Supplemental Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 64.9	$ 45.8
Accounts receivable, net	372.0	321.5
Inventories	260.5	222.3
Prepaid expenses and other current assets	202.8	215.8
Total Current Assets	900.2	805.4
Property, plant and equipment, net	435.8	420.8
Goodwill	732.3	723.0	$ 732.7
Other intangible assets, net	641.4	649.3
Operating lease right-of-use assets	245.4	0.0
Deferred income taxes	14.1	22.6
Other non-current assets	92.6	94.3
Net investment in subsidiaries	0.0	0.0
Due from affiliates	0.0	0.0
Total Assets	3,061.8	2,715.4
Current Liabilities:
Accounts payable	251.7	253.0
Accrued expenses and other current liabilities	473.2	359.2
Income taxes payable	11.0	9.7
Current portion of long-term debt	37.4	47.1
Total Current Liabilities	773.3	669.0
Long-term debt, net	1,502.6	1,599.1
Long-term operating lease obligations	205.4	0.0
Deferred income taxes	102.1	117.5
Other non-current liabilities	118.0	112.3
Due to affiliates	0.0	0.0
Total Liabilities	2,701.4	2,497.9
Total Stockholders' Equity	360.4	217.5	$ 112.5	$ (41.9)
Total Liabilities and Stockholders' Equity	3,061.8	2,715.4
Reportable Legal Entities | Tempur Sealy International, Inc. (Ultimate Parent)
Current Assets:
Cash and cash equivalents	0.2	0.1
Accounts receivable, net	0.2	0.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	12.9	276.9
Total Current Assets	13.3	277.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Operating lease right-of-use assets	0.0
Deferred income taxes	13.0	15.0
Other non-current assets	0.4	0.0
Net investment in subsidiaries	1,143.3	661.7
Due from affiliates	341.6	422.1
Total Assets	1,511.6	1,375.8
Current Liabilities:
Accounts payable	0.0	0.0
Accrued expenses and other current liabilities	6.8	6.7
Income taxes payable	0.0	0.0
Current portion of long-term debt	0.0	0.0
Total Current Liabilities	6.8	6.7
Long-term debt, net	1,044.3	1,043.0
Long-term operating lease obligations	0.0
Deferred income taxes	0.0	0.0
Other non-current liabilities	0.2	1.9
Due to affiliates	99.9	106.7
Total Liabilities	1,151.2	1,158.3
Total Stockholders' Equity	360.4	217.5
Total Liabilities and Stockholders' Equity	1,511.6	1,375.8
Reportable Legal Entities | Combined Guarantor Subsidiaries
Current Assets:
Cash and cash equivalents	20.0	6.2
Accounts receivable, net	21.9	15.2
Inventories	199.9	159.4
Prepaid expenses and other current assets	59.5	65.4
Total Current Assets	301.3	246.2
Property, plant and equipment, net	366.5	350.7
Goodwill	511.2	508.8
Other intangible assets, net	564.3	572.7
Operating lease right-of-use assets	198.2
Deferred income taxes	0.0	0.0
Other non-current assets	46.6	49.2
Net investment in subsidiaries	369.0	210.0
Due from affiliates	125.4	153.8
Total Assets	2,482.5	2,091.4
Current Liabilities:
Accounts payable	198.4	186.7
Accrued expenses and other current liabilities	245.7	143.9
Income taxes payable	10.0	274.7
Current portion of long-term debt	29.5	44.0
Total Current Liabilities	483.6	649.3
Long-term debt, net	458.1	547.1
Long-term operating lease obligations	172.4
Deferred income taxes	98.5	118.0
Other non-current liabilities	59.4	58.2
Due to affiliates	67.2	57.1
Total Liabilities	1,339.2	1,429.7
Total Stockholders' Equity	1,143.3	661.7
Total Liabilities and Stockholders' Equity	2,482.5	2,091.4
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries
Current Assets:
Cash and cash equivalents	44.7	39.5
Accounts receivable, net	352.5	303.3
Inventories	60.6	62.9
Prepaid expenses and other current assets	140.2	148.1
Total Current Assets	598.0	553.8
Property, plant and equipment, net	69.3	70.1
Goodwill	221.1	214.2
Other intangible assets, net	77.1	76.6
Operating lease right-of-use assets	47.2
Deferred income taxes	14.1	22.6
Other non-current assets	45.6	45.1
Net investment in subsidiaries	0.0	0.0
Due from affiliates	19.6	15.4
Total Assets	1,092.0	997.8
Current Liabilities:
Accounts payable	55.9	63.3
Accrued expenses and other current liabilities	220.7	208.6
Income taxes payable	10.8	9.6
Current portion of long-term debt	7.9	3.1
Total Current Liabilities	295.3	284.6
Long-term debt, net	0.2	9.0
Long-term operating lease obligations	33.0
Deferred income taxes	16.6	14.5
Other non-current liabilities	58.4	52.2
Due to affiliates	319.5	427.5
Total Liabilities	723.0	787.8
Total Stockholders' Equity	369.0	210.0
Total Liabilities and Stockholders' Equity	1,092.0	997.8
Reclassifications and Eliminations
Current Assets:
Cash and cash equivalents	0.0	0.0
Accounts receivable, net	(2.6)	3.0
Inventories	0.0	0.0
Prepaid expenses and other current assets	(9.8)	(274.6)
Total Current Assets	(12.4)	(271.6)
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Other intangible assets, net	0.0	0.0
Operating lease right-of-use assets	0.0
Deferred income taxes	(13.0)	(15.0)
Other non-current assets	0.0	0.0
Net investment in subsidiaries	(1,512.3)	(871.7)
Due from affiliates	(486.6)	(591.3)
Total Assets	(2,024.3)	(1,749.6)
Current Liabilities:
Accounts payable	(2.6)	3.0
Accrued expenses and other current liabilities	0.0	0.0
Income taxes payable	(9.8)	(274.6)
Current portion of long-term debt	0.0	0.0
Total Current Liabilities	(12.4)	(271.6)
Long-term debt, net	0.0	0.0
Long-term operating lease obligations	0.0
Deferred income taxes	(13.0)	(15.0)
Other non-current liabilities	0.0	0.0
Due to affiliates	(486.6)	(591.3)
Total Liabilities	(512.0)	(877.9)
Total Stockholders' Equity	(1,512.3)	(871.7)
Total Liabilities and Stockholders' Equity	$ (2,024.3)	$ (1,749.6)