Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment			2
Segment information [Abstract]
Total assets	$ 2,739.4		$ 2,739.4		$ 2,662.6
Total property, plant and equipment, net	360.5		360.5		355.6
Net sales	880.0	$ 827.4	2,383.9	$ 2,244.3
Inter-segment sales	0.0	0.0	0.0	0.0
Gross profit	359.6	318.5	935.8	856.3
Inter-segment royalty expense (income)	0.0	0.0	0.0	0.0
Operating income (loss)	110.9	87.1	217.3	199.8
Income (loss) before income taxes	65.9	59.9	130.5	106.5
Depreciation and amortization (including stock-based compensation amortization)	23.0	21.6	71.3	67.1
Capital expenditures	17.1	13.4	51.1	30.3
United States
Segment information [Abstract]
Total property, plant and equipment, net	298.0		298.0		287.3
Net sales	684.8	624.8	1,813.4	1,653.1
Canada
Segment information [Abstract]
Total property, plant and equipment, net	7.2		7.2		8.0
Net sales	56.4	60.5	152.2	162.7
Other International
Segment information [Abstract]
Total property, plant and equipment, net	55.3		55.3		60.3
Net sales	138.8	142.1	418.3	428.5
Total International
Segment information [Abstract]
Total property, plant and equipment, net	62.5		62.5		68.3
Net sales	195.2	202.6	570.5	591.2
Bedding sales
Segment information [Abstract]
Net sales	801.0	755.3	2,188.1	2,048.7
Other sales
Segment information [Abstract]
Net sales	79.0	72.1	195.8	195.6
Operating Segments
Segment information [Abstract]
Total property, plant and equipment, net	360.5		360.5		355.6
Operating Segments \| North America
Segment information [Abstract]
Total assets	2,573.2		2,573.2		2,507.4
Total property, plant and equipment, net	239.0		239.0		240.5
Net sales	741.2	685.3	1,965.6	1,815.8
Inter-segment sales	1.0	2.0	4.5	3.8
Gross profit	287.7	243.9	718.2	624.8
Inter-segment royalty expense (income)	2.0	1.7	5.3	4.6
Operating income (loss)	118.4	86.4	240.9	188.3
Income (loss) before income taxes	114.4	83.2	233.0	163.1
Depreciation and amortization (including stock-based compensation amortization)	11.3	10.8	33.5	36.7
Capital expenditures	5.6	5.1	23.7	12.2
Operating Segments \| North America \| Bedding sales
Segment information [Abstract]
Net sales	690.8	645.8	1,854.2	1,710.8
Operating Segments \| North America \| Other sales
Segment information [Abstract]
Net sales	50.4	39.5	111.4	105.0
Operating Segments \| International
Segment information [Abstract]
Total assets	484.0		484.0		474.3
Total property, plant and equipment, net	55.3		55.3		60.3
Net sales	138.8	142.1	418.3	428.5
Inter-segment sales	0.2	0.1	0.5	0.2
Gross profit	71.9	74.6	217.6	231.5
Inter-segment royalty expense (income)	(2.0)	(1.7)	(5.3)	(4.6)
Operating income (loss)	23.0	26.1	72.0	83.9
Income (loss) before income taxes	1.7	25.3	47.8	80.5
Depreciation and amortization (including stock-based compensation amortization)	4.0	3.8	12.1	12.0
Capital expenditures	4.4	3.9	9.8	9.2
Operating Segments \| International \| Bedding sales
Segment information [Abstract]
Net sales	110.2	109.5	333.9	337.9
Operating Segments \| International \| Other sales
Segment information [Abstract]
Net sales	28.6	32.6	84.4	90.6
Corporate
Segment information [Abstract]
Total assets	709.2		709.2		858.5
Total property, plant and equipment, net	66.2		66.2		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
Inter-segment royalty expense (income)	0.0	0.0	0.0	0.0
Operating income (loss)	(30.5)	(25.4)	(95.6)	(72.4)
Income (loss) before income taxes	(50.2)	(48.6)	(150.3)	(137.1)
Depreciation and amortization (including stock-based compensation amortization)	7.7	7.0	25.7	18.4
Capital expenditures	7.1	4.4	17.6	8.9
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	(1,027.0)		(1,027.0)		$ (1,177.6)
Net sales	0.0	0.0	0.0	0.0
Inter-segment sales	(1.2)	(2.1)	(5.0)	(4.0)
Gross profit	0.0	0.0	0.0	0.0
Inter-segment 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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