Business Segment Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			2
Segment information [Abstract]
Total assets	$ 2,719.4		$ 2,719.4		$ 2,655.5
Total property, plant and equipment, net	362.2		362.2		361.7
Net sales	804.4	$ 764.4	1,525.4	$ 1,503.9
Inter-segment sales	0.0	0.0	0.0	0.0
Inter-segment royalty expense (income)	0.0	0.0	0.0	0.0
Gross profit	336.9	297.5	627.9	576.2
Operating income (loss)	100.2	52.0	176.9	106.4
Income (loss) before income taxes	29.2	29.3	85.5	64.6
Depreciation and amortization (including stock-based compensation amortization)	22.9	26.5	46.6	48.3
Capital expenditures	11.7	18.6	24.3	34.0
United States
Segment information [Abstract]
Total property, plant and equipment, net	300.8		300.8		300.1
Net sales	614.1	580.9	1,151.3	1,128.6
Canada
Segment information [Abstract]
Total property, plant and equipment, net	7.1		7.1		6.8
Net sales	54.1	49.4	96.9	95.8
Other International
Segment information [Abstract]
Total property, plant and equipment, net	54.3		54.3		54.8
Net sales	136.2	134.1	277.2	279.5
Total International
Segment information [Abstract]
Total property, plant and equipment, net	61.4		61.4		61.6
Net sales	190.3	183.5	374.1	375.3
Bedding sales
Segment information [Abstract]
Net sales	744.8	711.4	1,412.3	1,387.1
Other sales
Segment information [Abstract]
Net sales	59.6	53.0	113.1	116.8
Operating Segments
Segment information [Abstract]
Total property, plant and equipment, net	362.2		362.2		361.7
Operating Segments \| North America
Segment information [Abstract]
Total assets	2,577.4		2,577.4		2,533.1
Total property, plant and equipment, net	237.8		237.8		239.2
Net sales	668.2	630.3	1,248.2	1,224.4
Inter-segment sales	1.3	1.8	2.5	3.5
Inter-segment royalty expense (income)	2.1	1.8	3.8	3.3
Gross profit	267.3	227.4	481.8	430.5
Operating income (loss)	103.3	64.6	180.6	122.5
Income (loss) before income taxes	100.2	62.1	177.2	118.6
Depreciation and amortization (including stock-based compensation amortization)	10.9	11.6	21.2	22.2
Capital expenditures	5.7	9.9	11.3	18.1
Operating Segments \| North America \| Bedding sales
Segment information [Abstract]
Net sales	636.2	604.8	1,190.6	1,163.4
Operating Segments \| North America \| Other sales
Segment information [Abstract]
Net sales	32.0	25.5	57.6	61.0
Operating Segments \| International
Segment information [Abstract]
Total assets	521.6		521.6		477.1
Total property, plant and equipment, net	54.3		54.3		54.8
Net sales	136.2	134.1	277.2	279.5
Inter-segment sales	0.1	0.2	0.1	0.3
Inter-segment royalty expense (income)	(2.1)	(1.8)	(3.8)	(3.3)
Gross profit	69.6	70.1	146.1	145.7
Operating income (loss)	23.2	23.7	50.5	49.0
Income (loss) before income taxes	21.0	20.8	45.4	46.1
Depreciation and amortization (including stock-based compensation amortization)	3.9	4.1	7.8	8.1
Capital expenditures	2.4	3.3	4.7	5.4
Operating Segments \| International \| Bedding sales
Segment information [Abstract]
Net sales	108.6	106.6	221.7	223.7
Operating Segments \| International \| Other sales
Segment information [Abstract]
Net sales	27.6	27.5	55.5	55.8
Corporate
Segment information [Abstract]
Total assets	700.7		700.7		775.0
Total property, plant and equipment, net	70.1		70.1		67.7
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	0.0	0.0	0.0	0.0
Inter-segment royalty expense (income)	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Operating income (loss)	(26.3)	(36.3)	(54.2)	(65.1)
Income (loss) before income taxes	(92.0)	(53.6)	(137.1)	(100.1)
Depreciation and amortization (including stock-based compensation amortization)	8.1	10.8	17.6	18.0
Capital expenditures	3.6	5.4	8.3	10.5
Corporate \| Bedding sales
Segment information [Abstract]
Net sales	0.0	0.0	0.0	0.0
Corporate \| Other sales
Segment information [Abstract]
Net sales	0.0	0.0	0.0	0.0
Inter-segment eliminations
Segment information [Abstract]
Total assets	(1,080.3)		(1,080.3)		$ (1,129.7)
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	(1.4)	(2.0)	(2.6)	(3.8)
Inter-segment royalty expense (income)	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Operating income (loss)	0.0	0.0	0.0	0.0
Income (loss) before income taxes	0.0	0.0	0.0	0.0
Depreciation and amortization (including stock-based compensation amortization)	0.0	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0	0.0
Inter-segment eliminations \| Bedding sales
Segment information [Abstract]
Net sales	0.0	0.0	0.0	0.0
Inter-segment eliminations \| Other sales
Segment information [Abstract]
Net sales	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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