Business Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment									2
Segment information [Abstract]
Total assets	$ 2,702.6				$ 2,655.5				$ 2,702.6	$ 2,655.5
Total property, plant and equipment, net	422.2				361.7				422.2	361.7
Net sales	769.5	$ 832.4	$ 804.4	$ 721.0	767.3	$ 880.0	$ 764.4	$ 739.5	3,127.3	3,151.2	$ 2,989.8
Inter-segment sales									0.0	0.0	0.0
Gross profit	319.4	362.1	336.9	291.0	313.1	359.6	297.5	278.7	1,309.4	1,248.9	1,150.4
Inter-segment royalty expense (income)									0.0	0.0	0.0
Operating income (loss)	107.5	$ 131.1	$ 100.2	$ 76.7	91.8	$ 110.9	$ 52.0	$ 54.4	415.5	309.1	276.3
Income (loss) before income taxes									283.3	200.1	174.9
Depreciation and amortization (including stock-based compensation amortization)									89.5	93.9	89.7
Capital expenditures									62.4	65.9	47.5
Bedding sales
Segment information [Abstract]
Net sales									2,891.5	2,887.2	2,726.5
Other sales
Segment information [Abstract]
Net sales									235.8	264.0	263.3
United States
Segment information [Abstract]
Total property, plant and equipment, net	360.7				300.1				360.7	300.1
Net sales									2,361.8	2,374.7	2,188.8
Canada
Segment information [Abstract]
Total property, plant and equipment, net	6.6				6.8				6.6	6.8
Net sales									208.3	202.5	216.1
Other International
Segment information [Abstract]
Total property, plant and equipment, net	54.9				54.8				54.9	54.8
Net sales									557.2	574.0	584.9
Total International
Segment information [Abstract]
Total property, plant and equipment, net	61.5				61.6				61.5	61.6
Net sales									765.5	776.5	801.0
Operating Segments
Segment information [Abstract]
Total property, plant and equipment, net	422.2				361.7				422.2	361.7
Operating Segments | Tempur North America
Segment information [Abstract]
Total assets	2,581.4				2,533.1				2,581.4	2,533.1
Total property, plant and equipment, net	297.4				239.2				297.4	239.2
Net sales									2,570.1	2,577.2	2,404.9
Inter-segment sales									4.6	5.9	5.1
Gross profit									1,017.4	954.6	834.8
Inter-segment royalty expense (income)									7.2	7.1	6.1
Operating income (loss)									411.8	335.6	255.0
Income (loss) before income taxes									406.8	324.4	228.0
Depreciation and amortization (including stock-based compensation amortization)									43.7	43.3	47.9
Capital expenditures									32.8	28.9	17.8
Operating Segments | Tempur North America | Bedding sales
Segment information [Abstract]
Net sales									2,447.8	2,428.9	2,261.9
Operating Segments | Tempur North America | Other sales
Segment information [Abstract]
Net sales									122.3	148.3	143.0
Operating Segments | Tempur International
Segment information [Abstract]
Total assets	572.6				477.1				572.6	477.1
Total property, plant and equipment, net	54.9				54.8				54.9	54.8
Net sales									557.2	574.0	584.9
Inter-segment sales									0.4	0.7	0.3
Gross profit									292.0	294.3	315.6
Inter-segment royalty expense (income)									(7.2)	(7.1)	(6.1)
Operating income (loss)									102.7	98.9	118.8
Income (loss) before income taxes									94.0	73.2	112.2
Depreciation and amortization (including stock-based compensation amortization)									15.6	16.0	16.3
Capital expenditures									15.3	14.8	15.6
Operating Segments | Tempur International | Bedding sales
Segment information [Abstract]
Net sales									443.7	458.3	464.6
Operating Segments | Tempur International | Other sales
Segment information [Abstract]
Net sales									113.5	115.7	120.3
Corporate
Segment information [Abstract]
Total assets	658.7				775.0				658.7	775.0
Total property, plant and equipment, net	69.9				67.7				69.9	67.7
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)									(99.0)	(125.4)	(97.5)
Income (loss) before income taxes									(217.5)	(197.5)	(165.3)
Depreciation and amortization (including stock-based compensation amortization)									30.2	34.6	25.5
Capital expenditures									14.3	22.2	14.1
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	$ (1,110.1)				$ (1,129.7)				(1,110.1)	(1,129.7)
Net sales									0.0	0.0	0.0
Inter-segment sales									(5.0)	(6.6)	(5.4)
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 (including stock-based compensation 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