Business Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			2
Segment information [Abstract]
Total assets	$ 2,746.2		$ 2,746.2		$ 2,655.5
Total property, plant and equipment, net	365.1		365.1		361.7
Net sales	832.4	$ 880.0	2,357.8	$ 2,383.9
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	362.1	359.6	990.0	935.8
Operating income (loss)	131.1	110.9	308.0	217.3
Income (loss) before income taxes	110.3	65.9	195.8	130.5
Depreciation and amortization (including stock-based compensation amortization)	23.0	23.0	69.6	71.3
Capital expenditures	17.6	17.1	41.9	51.1
United States
Segment information [Abstract]
Total property, plant and equipment, net	303.2		303.2		300.1
Net sales	641.4	684.8	1,792.7	1,813.4
Canada
Segment information [Abstract]
Total property, plant and equipment, net	7.0		7.0		6.8
Net sales	57.1	56.4	154.0	152.2
Other International
Segment information [Abstract]
Total property, plant and equipment, net	54.9		54.9		54.8
Net sales	133.9	138.8	411.1	418.3
Total International
Segment information [Abstract]
Total property, plant and equipment, net	61.9		61.9		61.6
Net sales	191.0	195.2	565.1	570.5
Bedding sales
Segment information [Abstract]
Net sales	773.7	801.0	2,186.0	2,188.1
Other sales
Segment information [Abstract]
Net sales	58.7	79.0	171.8	195.8
Operating Segments
Segment information [Abstract]
Total property, plant and equipment, net	365.1		365.1		361.7
Operating Segments \| North America
Segment information [Abstract]
Total assets	2,521.2		2,521.2		2,533.1
Total property, plant and equipment, net	240.0		240.0		239.2
Net sales	698.5	741.2	1,946.7	1,965.6
Inter-segment sales	1.0	1.0	3.5	4.5
Inter-segment royalty expense (income)	1.8	2.0	5.6	5.3
Gross profit	290.1	287.7	771.9	718.2
Operating income (loss)	128.3	118.4	308.9	240.9
Income (loss) before income taxes	127.1	114.4	304.3	233.0
Depreciation and amortization (including stock-based compensation amortization)	10.8	11.3	32.1	33.5
Capital expenditures	10.7	5.6	22.0	23.7
Operating Segments \| North America \| Bedding sales
Segment information [Abstract]
Net sales	667.6	690.8	1,858.2	1,854.2
Operating Segments \| North America \| Other sales
Segment information [Abstract]
Net sales	30.9	50.4	88.5	111.4
Operating Segments \| International
Segment information [Abstract]
Total assets	604.8		604.8		477.1
Total property, plant and equipment, net	54.9		54.9		54.8
Net sales	133.9	138.8	411.1	418.3
Inter-segment sales	0.2	0.2	0.4	0.5
Inter-segment royalty expense (income)	(1.8)	(2.0)	(5.6)	(5.3)
Gross profit	72.0	71.9	218.1	217.6
Operating income (loss)	25.6	23.0	76.1	72.0
Income (loss) before income taxes	23.6	1.7	69.0	47.8
Depreciation and amortization (including stock-based compensation amortization)	4.0	4.0	11.7	12.1
Capital expenditures	3.6	4.4	8.3	9.8
Operating Segments \| International \| Bedding sales
Segment information [Abstract]
Net sales	106.1	110.2	327.8	333.9
Operating Segments \| International \| Other sales
Segment information [Abstract]
Net sales	27.8	28.6	83.3	84.4
Corporate
Segment information [Abstract]
Total assets	665.6		665.6		775.0
Total property, plant and equipment, net	70.2		70.2		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)	(22.8)	(30.5)	(77.0)	(95.6)
Income (loss) before income taxes	(40.4)	(50.2)	(177.5)	(150.3)
Depreciation and amortization (including stock-based compensation amortization)	8.2	7.7	25.8	25.7
Capital expenditures	3.3	7.1	11.6	17.6
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	(1,045.4)		(1,045.4)		$ (1,129.7)
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	(1.2)	(1.2)	(3.9)	(5.0)
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)	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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