Segment Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			2
Segment information [Abstract]
Total assets	$ 2,716.9		$ 2,716.9		$ 2,662.6
Total property, plant and equipment, net	358.6		358.6		355.6
Net sales	764.4	$ 715.0	1,503.9	$ 1,416.9
Inter-segment sales	0.0	0.0	0.0	0.0
Gross profit	297.5	268.3	576.2	537.8
Intersegment royalty expense (income)	0.0	0.0	0.0	0.0
Operating income (loss)	52.0	50.3	106.4	112.7
Income (loss) before income taxes	29.3	7.4	64.6	46.6
Depreciation and amortization (including stock-based compensation amortization)	26.5	21.5	48.3	45.5
Capital expenditures	18.6	9.1	34.0	16.9
United States
Segment information [Abstract]
Total property, plant and equipment, net	295.6		295.6		287.3
Net sales	580.9	524.3	1,128.6	1,028.3
Canada
Segment information [Abstract]
Total property, plant and equipment, net	7.5		7.5		8.0
Net sales	49.4	53.6	95.8	102.2
Other International
Segment information [Abstract]
Total property, plant and equipment, net	55.5		55.5		60.3
Net sales	134.1	137.1	279.5	286.4
Total International
Segment information [Abstract]
Total property, plant and equipment, net	63.0		63.0		68.3
Net sales	183.5	190.7	375.3	388.6
Bedding sales
Segment information [Abstract]
Net sales	711.4	657.4	1,387.1	1,293.4
Other sales
Segment information [Abstract]
Net sales	53.0	57.6	116.8	123.5
Operating Segments
Segment information [Abstract]
Total property, plant and equipment, net	358.6		358.6		355.6
Operating Segments \| North America
Segment information [Abstract]
Total assets	2,577.5		2,577.5		2,507.4
Total property, plant and equipment, net	241.7		241.7		240.5
Net sales	630.3	577.9	1,224.4	1,130.5
Inter-segment sales	1.8	1.7	3.5	1.8
Gross profit	227.4	194.7	430.5	380.9
Intersegment royalty expense (income)	1.8	1.4	3.3	2.9
Operating income (loss)	64.6	48.8	122.5	101.9
Income (loss) before income taxes	62.1	28.4	118.6	79.9
Depreciation and amortization (including stock-based compensation amortization)	11.6	12.6	22.2	25.9
Capital expenditures	9.9	2.4	18.1	7.1
Operating Segments \| North America \| Bedding sales
Segment information [Abstract]
Net sales	604.8	547.9	1,163.4	1,065.0
Operating Segments \| North America \| Other sales
Segment information [Abstract]
Net sales	25.5	30.0	61.0	65.5
Operating Segments \| International
Segment information [Abstract]
Total assets	481.8		481.8		474.3
Total property, plant and equipment, net	55.5		55.5		60.3
Net sales	134.1	137.1	279.5	286.4
Inter-segment sales	0.2	0.1	0.3	0.1
Gross profit	70.1	73.6	145.7	156.9
Intersegment royalty expense (income)	(1.8)	(1.4)	(3.3)	(2.9)
Operating income (loss)	23.7	24.3	49.0	57.8
Income (loss) before income taxes	20.8	23.3	46.1	55.2
Depreciation and amortization (including stock-based compensation amortization)	4.1	4.6	8.1	8.2
Capital expenditures	3.3	3.4	5.4	5.3
Operating Segments \| International \| Bedding sales
Segment information [Abstract]
Net sales	106.6	109.5	223.7	228.4
Operating Segments \| International \| Other sales
Segment information [Abstract]
Net sales	27.5	27.6	55.8	58.0
Corporate
Segment information [Abstract]
Total assets	698.8		698.8		858.5
Total property, plant and equipment, net	61.4		61.4		54.8
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	0.0	0.0	0.0	0.0
Gross profit	0.0	0.0	0.0	0.0
Intersegment royalty expense (income)	0.0	0.0	0.0	0.0
Operating income (loss)	(36.3)	(22.8)	(65.1)	(47.0)
Income (loss) before income taxes	(53.6)	(44.3)	(100.1)	(88.5)
Depreciation and amortization (including stock-based compensation amortization)	10.8	4.3	18.0	11.4
Capital expenditures	5.4	3.3	10.5	4.5
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	(1,041.2)		(1,041.2)		$ (1,177.6)
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	(2.0)	(1.8)	(3.8)	(1.9)
Gross profit	0.0	0.0	0.0	0.0
Intersegment royalty expense (income)	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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